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handy.h: New defn of isOCTAL_A() to free up bit
The new definition is likely slightly faster, as it replaces an array
lookup with a mask.
Comments are also added, listing the other possible candidates for this
treatment, though the speed differential is unclear as they would also
add an extra test.
A U32 is used to store the information about the various properties for
a character. This frees up one bit of that for future other use.
https://perl5.git.perl.org / perl5.git / commit