Options: Add support for parsing double dot in ratio

[mwestphal]

No description provided.

[snoyer]

could use const std::size_t sign = str.find_first_of("/:") so save looking through twice and avoid the mutable index

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.67%. Comparing base (fda96ea) to head (3fd091e).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1839      +/-   ##
==========================================
- Coverage   95.70%   95.67%   -0.04%     
==========================================
  Files         125      125              
  Lines        9821     9821              
==========================================
- Hits         9399     9396       -3     
- Misses        422      425       +3     

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