I'm trying to remember to benchmark more myself. Some quick benchmarking I did suggests they're all within the margin of error. Rest deleted

Update: Error is in front of keyboard. There's a big difference if I actually write my benchmark code correctly.

(Each loop did a refaddr on one object, one hash ref, and one ref to a constant.)

# overload used on object
               Rate bless_regex   strval_0+    bless_0+
bless_regex 12921/s          --        -34%        -37%
strval_0+   19557/s         51%          --         -5%
bless_0+    20495/s         59%          5%          --

# no overloading ( and overload not loaded )
                Rate bless_regex    bless_0+   strval_0+
bless_regex  13504/s          --        -35%        -93%
bless_0+     20766/s         54%          --        -90%
strval_0+   206767/s       1431%        896%          --

# bless_regex: fixed PP version from Scalar::Util to store package usi
+ng PP blessed, and only rebless if reference is blessed

# bless_0+: same as above, but use 0+$ref instead of regex extraction

# strval_0+: if overload loaded and reference is overloaded, use StrVa
+l to extract with regex, otherwise, use 0+$ref
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