Unit handling in JSON@0.21

[fhagemann]

Hi,
the unit handling (using units with Unitful) seems to be broken in JSON@0.21 and fixed in JSON@1.

using Unitful, JSON
JSON.parse(JSON.json(1u"m"))

will result in

# JSON@0.21
Dict{String, Any} with 1 entry:
  "val" => 1

# JSON@1
"1.0 m"

so JSON@0.21 does not even remember the unit and parses it as dictionary..

Is there any way to fix the unit handling and make a release 0.21.5 with it? Or is pre-1 development discontinued?