This doesn't work yet.

See:
https://github.com/purescript-contrib/purescript-argonaut-codecs/blob/v5.1.2/src/Data/Argonaut/Decode/Combinators.purs#L97

- range slider precision fix
- added edge size bounds
- fixed Globals 4.1.0 dependency (was 4.0.0 which was missing lots of
functions)
- upgraded purescript to 0.13.3 (has better error messages, with diff)

purs repl works now