graphicore/ufoJS — pull request #12 by monkeyiq (2014-09-19 02:42:31+00:00)
Title: Allow a callback to record glyphs which load badly. The default is to

throw an exception in such cases which should preserve the previous
behavior.

For importing glyphs metapolator can set a different callback and
allow the load to proceed beyond the failing glyph.

This is for metapolator issue https://github.com/metapolator/metapolator/issues/144