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Use the passed context for to_str checks in Array#join - #9964
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For each element that is neither a String nor an Array, joinAny called checkStringType(), which looks up the current thread context and its call sites on every element. Check with the context joinAny already has and a call site cached for the loop, as to_ary_checked already is. Joining 100 Integers or Symbols goes from about 72 to 60 ns per element on arm64-darwin.
headius
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Oct 30, 2026
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For each element that is neither a String nor an Array, joinAny called checkStringType(), which looks up the current thread context and its call sites on every element. Check with the context joinAny already has and a call site cached for the loop, as to_ary_checked already is.
Joining 100 Integers or Symbols goes from about 72 to 60 ns per element on arm64-darwin.
This came up from searching for something like ruby/ruby#18610 in JRuby.