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doc/extension.rdoc: warn about kwargs performance in C [ci skip]

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This existing API seems doomed performance-wise, and writing
things in Ruby is nicer anyways.  So discourage folks from
using it.

[Feature #11339]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52925 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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normal 2015-12-07 18:49:49 +00:00
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ChangeLog
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@ -1,3 +1,8 @@
Tue Dec 8 03:45:47 2015 Eric Wong <e@80x24.org>
* doc/extension.rdoc: warn about kwargs performance in C
[Feature #11339] [ci skip]
Tue Dec 8 03:44:51 2015 Koichi Sasada <ko1@atdot.net>
* iseq.c (iseq_load): disable peephole optimization option

5
doc/extension.rdoc
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@ -1412,6 +1412,11 @@ int rb_get_kwargs(VALUE keyword_hash, const ID *table, int required, int optiona
next to optional +values+ as a new Hash, otherwise raises "unknown
keyword" +ArgumentError+.
Be warned, handling keyword arguments in the C API is less efficient
than handling them in Ruby. Consider using a Ruby wrapper method
around a non-keyword C function.
ref: https://bugs.ruby-lang.org/issues/11339
VALUE rb_extract_keywords(VALUE *original_hash)
Extracts pairs whose key is a symbol into a new hash from a hash