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I like how much your code deletes! But this seems like a wide departure from the original, with extra string concatenation for something with known size. EIther the string should be allocated ahead of time (which doesn't look that easy to do with cruby's API), or the concatenation should be avoided (easy). Here's the (rough + untested) cruby equivalent to the original code + your encoding differences:
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Thank you @zenspider for reviewing!
rb_enc_str_new_cstr()
allocates a struct RString with an embedded string length of 23 bytes at maximum. So each string has a capacity of 23 ASCII characters from the start. Since namespace keys tend to be shorter, usually no reallocation is required. Given thatsprintf
is usually slower due to format string interpretation, I think the proposed implementation is best how it is.