Tags: BookingBug/bitset

Use static linkage for bitset helper functions

inline alone does not guarantee symbol emission in C99 -- the compiler
may inline at call sites and omit the standalone symbol. When the code
takes function pointers (&bitset_or etc), the linker fails with
'undefined symbol: bitset_or'. Change to static to ensure symbols are
always available in the translation unit.

Version 1.2.1

Added [index, [len]] as optional arguments to #each_set

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