rational.c: infinity in power

	* rational.c (nurat_expt): return 0 due to overflow.
	  [ruby-core:79686] [Bug #13242]:
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	r57690 | nobu | 2017-02-23 10:15:27 +0900 (Thu, 23 Feb 2017) | 7 lines

	[DOC] {read,write}_nonblock with exception: false

	Update docs to reflect EOF behavior change of read_nonblock and
	write_nonblock when using `exception: false`.

	[Fix GH-1527]
	Author:    Russell Davis <russell-stripe@users.noreply.github.com>
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	r57691 | nobu | 2017-02-23 10:54:13 +0900 (Thu, 23 Feb 2017) | 11 lines

	socket.rb: [DOC] fix nonblock methods

	* ext/socket/lib/socket.rb (BasicSocket#recv_nonblock): fix
	  exception class and symbol.

	* ext/socket/lib/socket.rb (BasicSocket#recvmsg_nonblock): ditto.

	* ext/socket/lib/socket.rb (Socket#recvfrom_nonblock): fix the
	  method name.

	* ext/socket/lib/socket.rb (UDPSocket#recvfrom_nonblock): both.
	------------------------------------------------------------------------
	r57692 | nobu | 2017-02-23 11:00:28 +0900 (Thu, 23 Feb 2017) | 1 line

	[DOC] keyword argument _exception_
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	r57693 | nobu | 2017-02-23 11:11:16 +0900 (Thu, 23 Feb 2017) | 1 line

	[DOC] mark up literals
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	r57694 | nobu | 2017-02-23 11:40:17 +0900 (Thu, 23 Feb 2017) | 3 lines

	Revert r57690 except for read_nonblock

	https://github.com/ruby/ruby/pull/1527#issuecomment-281867551

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@57900 b2dd03c8-39d4-4d8f-98ff-823fe69b080e