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Feature #20429
closed
Emit a performance warning when specially optimized core methods are redefined
Status:
Closed
Assignee:
-
Target version:
-
Description
MRI has a number of core methods with special handling in the interpreter and both JITs that if they are redefined negatively impact Ruby performance.
The methods currently are (I may be missing a few):
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Integer:#+,#-,#*,#/,#%,#<,#>,#<=,#>= -
Float:#+,#-,#*,#/,#<,#>,#<=,#>= -
String:#freeze,#size,#length,#empty?,#+,#succ,#%,#-@ -
Array:#size,#length,#empty?,#hash -
Hash:#size,#length,#empty?,#[],#[]=
Noticing that a dependency do redefine one of these methods can be non-trivial, so I'd like to emit a :performance warning when it happens.
I can't really think of much reasons to redefine these aside from fun hacks, so I believe discouraging it would be valuable.
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