Unicode support in value fetching.

[ferd]

See erlang/rebar3#2644

The issue is located within https://github.com/soranoba/bbmustache, specifically at

bbmustache/src/bbmustache.erl

Line 278 in 7631da9

Value = iolist_to_binary(ValueSerializer(get_data_recursive(Keys, Data, <<>>, State))),

, where the code should likely call for unicode:characters_to_binary instead of iolist_to_binary.

There are likely other locations for such calls, but sending in unicode data that has a wide representation can break when the codepoints get too large with the current calls.

[soranoba]

I'm checking the correction within the scope of the test.
If you need to take other measures, please create a new issue.

Thanks for the report