Right now, every heap function is given a new annotations dictionary even if annotations aren't used.  How about we create these lazily in order to speed-up function creation time, improve start-up time, and save space.


>>> def f(): pass

>>> def g(): return 1

>>> f.__annotations__
{}
>>> g.__annotations__
{}
>>> hex(id(f.__annotations__))
'0x109207e40'
>>> hex(id(g.__annotations__))
'0x1092296c0'