Hello, I use decorators in my Python project. I tested project with cProfile(profiling). Then,
I decide did test with some decorator code fragments. Some results were surprising:

import functools
import cProfile

def decor(func):
    @functools.wraps(func)
    def wraps(*args, **kwargs):
        return func(*args, **kwargs)
    return wraps

@decor
def count(g_val):
    if g_val < 1:
        print("End")
    else:
        count(g_val - 1)
 
cProfile.run('count(102)')

OS names: Windows, Linux  -  x64
Python versions: 3.6.8, 3.4.3  -  x64

# cProfile using into the .py file
python dec_profile.py

End
         210 function calls (6 primitive calls) in 0.000 seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.000    0.000    0.000    0.000 <string>:1(<module>)
    103/1    0.000    0.000    0.000    0.000 timeer.py:10(count)
    103/1    0.000    0.000    0.000    0.000 timeer.py:5(wraps)
        1    0.000    0.000    0.000    0.000 {built-in method builtins.exec}
        1    0.000    0.000    0.000    0.000 {built-in method builtins.print}
        1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}

# Instead of 102 used ---> 82, 22, 33, 72 and etc. also gave me strange results like in 102. 
This behaviour can be changing sometimes, but usually give an incorrect results.

import functools
import cProfile

def decor(func):
    @functools.wraps(func)
    def wraps(*args, **kwargs):
        return func(*args, **kwargs)
    return wraps

@decor
def count(g_val):
    if g_val < 1:
        print("End")
    else:
        count(g_val - 1)
 
count(102)

# cProfile using via command line
python -m cProfile dec_profile.py

End
         539 function calls (334 primitive calls) in 0.002 seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:103(release)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:143(__init__)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:147(__enter__)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:151(__exit__)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:157(_get_module_lock)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:176(cb)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:211(_call_with_frames_removed)
       26    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:222(_verbose_message)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:307(__init__)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:311(__enter__)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:318(__exit__)
        4    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:321(<genexpr>)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:35(_new_module)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:369(__init__)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:403(cached)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:416(parent)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:424(has_location)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:504(_init_module_attrs)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:564(module_from_spec)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:58(__init__)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:651(_load_unlocked)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:707(find_spec)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:78(acquire)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:780(find_spec)
        3    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:843(__enter__)
        3    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:847(__exit__)
        1    0.000    0.000    0.001    0.001 <frozen importlib._bootstrap>:870(_find_spec)
        1    0.000    0.000    0.001    0.001 <frozen importlib._bootstrap>:936(_find_and_load_unlocked)
        1    0.000    0.000    0.001    0.001 <frozen importlib._bootstrap>:966(_find_and_load)
        6    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:1080(_path_importer_cache)
        1    0.000    0.000    0.001    0.001 <frozen importlib._bootstrap_external>:1117(_get_spec)
        1    0.000    0.000    0.001    0.001 <frozen importlib._bootstrap_external>:1149(find_spec)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:1228(_get_spec)
        5    0.000    0.000    0.001    0.000 <frozen importlib._bootstrap_external>:1233(find_spec)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:263(cache_from_source)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:361(_get_cached)
        5    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:37(_relax_case)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:393(_check_name_wrapper)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:430(_validate_bytecode_header)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:485(_compile_bytecode)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:52(_r_long)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:524(spec_from_file_location)
       25    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:57(_path_join)
       25    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:59(<listcomp>)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:63(_path_split)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:669(create_module)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:672(exec_module)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:743(get_code)
        7    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:75(_path_stat)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:800(__init__)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:825(get_filename)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:830(get_data)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:840(path_stats)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:85(_path_is_mode_type)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:94(_path_isfile)
        1    0.000    0.000    0.000    0.000 cProfile.py:27(Profile)
        1    0.000    0.000    0.000    0.000 cProfile.py:5(<module>)
        1    0.000    0.000    0.000    0.000 functools.py:44(update_wrapper)
        1    0.000    0.000    0.000    0.000 functools.py:74(wraps)
        1    0.000    0.000    0.002    0.002 timeer.py:1(<module>)
    103/1    0.000    0.000    0.000    0.000 timeer.py:10(count)
        1    0.000    0.000    0.000    0.000 timeer.py:4(decor)
    103/1    0.000    0.000    0.000    0.000 timeer.py:5(wraps)
        1    0.000    0.000    0.000    0.000 {built-in method _imp._fix_co_filename}
        5    0.000    0.000    0.000    0.000 {built-in method _imp.acquire_lock}
        1    0.000    0.000    0.000    0.000 {built-in method _imp.is_builtin}
        1    0.000    0.000    0.000    0.000 {built-in method _imp.is_frozen}
        5    0.000    0.000    0.000    0.000 {built-in method _imp.release_lock}
        2    0.000    0.000    0.000    0.000 {built-in method _thread.allocate_lock}
        2    0.000    0.000    0.000    0.000 {built-in method _thread.get_ident}
        1    0.000    0.000    0.000    0.000 {built-in method builtins.__build_class__}
        1    0.000    0.000    0.000    0.000 {built-in method builtins.any}
      2/1    0.000    0.000    0.002    0.002 {built-in method builtins.exec}
       13    0.000    0.000    0.000    0.000 {built-in method builtins.getattr}
        7    0.000    0.000    0.000    0.000 {built-in method builtins.hasattr}
        7    0.000    0.000    0.000    0.000 {built-in method builtins.isinstance}
        4    0.000    0.000    0.000    0.000 {built-in method builtins.len}
        1    0.000    0.000    0.000    0.000 {built-in method builtins.print}
        5    0.000    0.000    0.000    0.000 {built-in method builtins.setattr}
        2    0.000    0.000    0.000    0.000 {built-in method from_bytes}
        1    0.000    0.000    0.000    0.000 {built-in method marshal.loads}
        3    0.000    0.000    0.000    0.000 {built-in method nt.fspath}
        2    0.000    0.000    0.000    0.000 {built-in method nt.getcwd}
        7    0.000    0.000    0.000    0.000 {built-in method nt.stat}
        1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}
        1    0.000    0.000    0.000    0.000 {method 'endswith' of 'str' objects}
        2    0.000    0.000    0.000    0.000 {method 'get' of 'dict' objects}
       27    0.000    0.000    0.000    0.000 {method 'join' of 'str' objects}
        1    0.000    0.000    0.000    0.000 {method 'read' of '_io.FileIO' objects}
        9    0.000    0.000    0.000    0.000 {method 'rpartition' of 'str' objects}
        2    0.000    0.000    0.000    0.000 {method 'rsplit' of 'str' objects}
       52    0.000    0.000    0.000    0.000 {method 'rstrip' of 'str' objects}
        1    0.000    0.000    0.000    0.000 {method 'update' of 'dict' objects}


Here also interesting results in computation with some factorial estimations:

import math
import cProfile

def fact(n):
    return sum(1 / math.factorial(n) for n in range(18))

print(cProfile.run('fact(200)'))

# cProfile into the .py file
python fact.py

42 function calls in 0.000 seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.000    0.000    0.000    0.000 <string>:1(<module>)
        1    0.000    0.000    0.000    0.000 timeer.py:5(fact)
       19    0.000    0.000    0.000    0.000 timeer.py:6(<genexpr>)
        1    0.000    0.000    0.000    0.000 {built-in method builtins.exec}
        1    0.000    0.000    0.000    0.000 {built-in method builtins.sum}
       18    0.000    0.000    0.000    0.000 {built-in method math.factorial}
        1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}

import math
import cProfile

def fact(n):
    print(sum(1 / math.factorial(n) for n in range(18)))

fact(200)

# cProfile using via command line
python -m cProfile fact.py

2.7182818284590455
         417 function calls (416 primitive calls) in 0.001 seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:103(release)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:143(__init__)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:147(__enter__)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:151(__exit__)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:157(_get_module_lock)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:176(cb)
        3    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:211(_call_with_frames_removed)
       27    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:222(_verbose_message)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:232(_requires_builtin_wrapper)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:307(__init__)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:311(__enter__)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:318(__exit__)
        8    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:321(<genexpr>)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:35(_new_module)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:369(__init__)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:403(cached)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:416(parent)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:424(has_location)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:433(spec_from_loader)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:504(_init_module_attrs)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:564(module_from_spec)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:58(__init__)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:651(_load_unlocked)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:707(find_spec)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:728(create_module)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:736(exec_module)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:753(is_package)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:78(acquire)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:780(find_spec)
        4    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:843(__enter__)
        4    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap>:847(__exit__)
        2    0.000    0.000    0.001    0.000 <frozen importlib._bootstrap>:870(_find_spec)
        2    0.000    0.000    0.001    0.001 <frozen importlib._bootstrap>:936(_find_and_load_unlocked)
        2    0.000    0.000    0.001    0.001 <frozen importlib._bootstrap>:966(_find_and_load)
        6    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:1080(_path_importer_cache)
        1    0.000    0.000    0.001    0.001 <frozen importlib._bootstrap_external>:1117(_get_spec)
        1    0.000    0.000    0.001    0.001 <frozen importlib._bootstrap_external>:1149(find_spec)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:1228(_get_spec)
        5    0.000    0.000    0.001    0.000 <frozen importlib._bootstrap_external>:1233(find_spec)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:263(cache_from_source)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:361(_get_cached)
        5    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:37(_relax_case)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:393(_check_name_wrapper)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:430(_validate_bytecode_header)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:485(_compile_bytecode)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:52(_r_long)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:524(spec_from_file_location)
       25    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:57(_path_join)
       25    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:59(<listcomp>)
        2    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:63(_path_split)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:669(create_module)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:672(exec_module)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:743(get_code)
        7    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:75(_path_stat)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:800(__init__)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:825(get_filename)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:830(get_data)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:840(path_stats)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:85(_path_is_mode_type)
        1    0.000    0.000    0.000    0.000 <frozen importlib._bootstrap_external>:94(_path_isfile)
        1    0.000    0.000    0.000    0.000 cProfile.py:27(Profile)
        1    0.000    0.000    0.000    0.000 cProfile.py:5(<module>)
        1    0.000    0.000    0.001    0.001 timeer.py:1(<module>)
        1    0.000    0.000    0.000    0.000 timeer.py:4(fact)
       19    0.000    0.000    0.000    0.000 timeer.py:5(<genexpr>)
        1    0.000    0.000    0.000    0.000 {built-in method _imp._fix_co_filename}
        8    0.000    0.000    0.000    0.000 {built-in method _imp.acquire_lock}
        1    0.000    0.000    0.000    0.000 {built-in method _imp.create_builtin}
        1    0.000    0.000    0.000    0.000 {built-in method _imp.exec_builtin}
        2    0.000    0.000    0.000    0.000 {built-in method _imp.is_builtin}
        1    0.000    0.000    0.000    0.000 {built-in method _imp.is_frozen}
        8    0.000    0.000    0.000    0.000 {built-in method _imp.release_lock}
        4    0.000    0.000    0.000    0.000 {built-in method _thread.allocate_lock}
        4    0.000    0.000    0.000    0.000 {built-in method _thread.get_ident}
        1    0.000    0.000    0.000    0.000 {built-in method builtins.__build_class__}
        2    0.000    0.000    0.000    0.000 {built-in method builtins.any}
      2/1    0.000    0.000    0.001    0.001 {built-in method builtins.exec}
       10    0.000    0.000    0.000    0.000 {built-in method builtins.getattr}
       11    0.000    0.000    0.000    0.000 {built-in method builtins.hasattr}
        7    0.000    0.000    0.000    0.000 {built-in method builtins.isinstance}
        4    0.000    0.000    0.000    0.000 {built-in method builtins.len}
        1    0.000    0.000    0.000    0.000 {built-in method builtins.print}
        1    0.000    0.000    0.000    0.000 {built-in method builtins.sum}
        2    0.000    0.000    0.000    0.000 {built-in method from_bytes}
        1    0.000    0.000    0.000    0.000 {built-in method marshal.loads}
       18    0.000    0.000    0.000    0.000 {built-in method math.factorial}
        3    0.000    0.000    0.000    0.000 {built-in method nt.fspath}
        2    0.000    0.000    0.000    0.000 {built-in method nt.getcwd}
        7    0.000    0.000    0.000    0.000 {built-in method nt.stat}
        1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}
        1    0.000    0.000    0.000    0.000 {method 'endswith' of 'str' objects}
        4    0.000    0.000    0.000    0.000 {method 'get' of 'dict' objects}
       27    0.000    0.000    0.000    0.000 {method 'join' of 'str' objects}
        1    0.000    0.000    0.000    0.000 {method 'read' of '_io.FileIO' objects}
       11    0.000    0.000    0.000    0.000 {method 'rpartition' of 'str' objects}
        2    0.000    0.000    0.000    0.000 {method 'rsplit' of 'str' objects}
       52    0.000    0.000    0.000    0.000 {method 'rstrip' of 'str' objects}

In cProfile documentation isn't talking about command line behaviour difference.