Marshalling nested rb `Date` to js `Date` is not working.

[awinograd]

ctx = MiniRacer::Context.new
ctx.eval("var foo = function (obj) { console.log(obj); }")
ctx.call("foo", { my_date: Date.today }) # JS logs => "{ my_date: "Undefined Conversion" }"

DateTime and Time both work fine. Looks like Date falls into the default case here: https://github.com/discourse/mini_racer/blob/b3c9b35859deb189586384f3ae927586a36dda14/ext/mini_racer_extension/mini_racer_extension.cc#L528

[awinograd]

This may be fixed by #128 since it looks like it falls back to to_s before Undefined conversion

At least partially so as js would get the value in string form (rather than a date obj)

[tisba]

Can confirm with 0.6.2. The nesting does not seem to be required, it also doesn't work when directly passing a Date object:

require "mini_racer"
require "date"

ctx = MiniRacer::Context.new
ctx.eval("var echoFn = (obj) => obj;")
ctx.call("echoFn", Date.today)
#  => "Undefined Conversion"

@awinograd Out of curiosity: How do you access the "JS logs" with MiniRacer? 🤔

@SamSaffron Am I right to assume this is a bug? Also, is there an overview on how types get translated in both directions?

[SamSaffron]

I would say it is kind of on the feature side of things vs bug, there is a missing conversion internally in the ruby2js part.

We should get this sorted though, agree. We should stop treating it as a string.