[ruby-cvs:62853] nobu:r55689 (trunk): util.c: do not underflow

[nobu at ruby-lang.org]

nobu	2016-07-15 17:08:59 +0900 (Fri, 15 Jul 2016)

  New Revision: 55689

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=55689

  Log:
    util.c: do not underflow
    
    * util.c (ruby_strtod): do not underflow only by preceeding zeros,
      which may be canceled out by the exponent.
      http://twitter.com/kazuho/status/753829998767714305

  Modified files:
    trunk/ChangeLog
    trunk/test/ruby/test_literal.rb
    trunk/util.c