[#175][#140] Ensure we return Floats, not Fixnum or Rational; fixes segfaults with mathn#245

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bf4 merged 2 commits intosimplecov-ruby:masterfrom bf4:fix-segfaults

Jul 7, 2014

+15-10

Commits on Jul 7, 2014

[simplecov-ruby#175 ][simplecov-ruby#140 ] Ensure we return Floats, not Fixnum or Rational; fixes segfaults with mathn
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Add CHANGELOG entry for simplecov-ruby#245
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