uopz_get_return incorrectly returns null if the method/function name contains upper-case characters

[darrenedale]

Issue can be reproduced with the following PHP code:

echo "Method SplFileInfo::getSize():\n";
echo "uopz_set_return(SplFileInfo::class, \"getSize\", 42): " . (uopz_set_return(SplFileInfo::class, "getSize", 42) ? "true" : "false") . "\n";
echo "(new SplFileInfo(\"any-file\"))->getSize(): " . (new SplFileInfo("any-file"))->getSize() . "\n";
echo "uopz_get_return(SplFileInfo::class, \"getSize\"): " . uopz_get_return(SplFileInfo::class, "getSize") . "\n";
echo "uopz_get_return(SplFileInfo::class, \"getsize\"): " . uopz_get_return(SplFileInfo::class, "getsize") . "\n";

Expected output:

Method SplFileInfo::getSize():
uopz_set_return(SplFileInfo::class, "getSize", 42): true
(new SplFileInfo("any-file"))->getSize(): 42
uopz_get_return(SplFileInfo::class, "getSize"): 42
uopz_get_return(SplFileInfo::class, "getsize"): 42

Actual output:

Method SplFileInfo::getSize():
uopz_set_return(SplFileInfo::class, "getSize", 42): true
(new SplFileInfo("any-file"))->getSize(): 42
uopz_get_return(SplFileInfo::class, "getSize"): 
uopz_get_return(SplFileInfo::class, "getsize"): 42

The root cause is that function names are lower-cased when they are inserted into the returns hash in uopz_get_return(), but are not lower-cased in the lookup in uopz_get_return().

[darrenedale]

I have a branch with a fix ready to roll. Are you interested in receiving a PR?