The deprecated struct features (float coercion, overflow wrapping) have 
been removed for py3k in r70497, r70688, r71754.  I don't plan to backport 
this to 2.7; I'll just try to fix the behaviour in a minimal way there.

One thing that's not clear to me:  what's the rationale for raising 
struct.error everywhere instead of more specific Python errors; e.g., 
TypeError for struct.pack('L', 'not an integer') and OverflowError for 
struct.pack('L', 10**100)?  Is there a particular use-case for "except 
struct.error"?