Re-factor heuristics to recognize unknown glyphs for |toUnicode|
Adjust the heuristics to recognize more cases of unknown glyphs for |toUnicode| (issue 5070)
Merge pull request #5095 from Snuffleupagus/issue-5070

Adjust the heuristics to recognize more cases of unknown glyphs for |toUnicode| (issue 5070)