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* string.c (rb_str_split_m): improve splitting into chars by an
empty string, without a regexp.
Comparison:
to_chars-1
built-ruby: 1273527.6 i/s
compare-ruby: 189423.3 i/s - 6.72x slower
to_chars-10
built-ruby: 120993.5 i/s
compare-ruby: 37075.8 i/s - 3.26x slower
to_chars-100
built-ruby: 15646.4 i/s
compare-ruby: 4012.1 i/s - 3.90x slower
to_chars-1000
built-ruby: 1295.1 i/s
compare-ruby: 408.5 i/s - 3.17x slower
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67582 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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