Fixes #226 and Fixes #227

[Zaid-Ajaj]

This PR includes TypeShape source file and removes the problematic code that checks for IsByRefLike dynamically since we don't need it afaik (fixes #226) I've also attempted to solve #227 where DateTimeKind wasn't preserved when sent over the wire (also because I wanted to dive into the MsgPack implementation a little bit)

@kerams Can you please have a look just to make sure I didn't do anything too dumb? Besides that I used the space of a int64 to send a enum which can only have values {0, 1, 2} 😅

[kerams]

Enums are supported so you can simply do

let kind = x.Read typeof<DateTimeKind> :?> DateTimeKind

and on the .NET write side (might have to move writeEnum higher up)

writeEnum dt.Kind out

It might be ever so slightly slower than what you did with explicit integer to enum mapping. Up to you ;)

[kerams]

There's no problem with using writeInt64. It won't write more bytes than necessary for each individual integer (could be 1, 2, 3, 5, or 9 bytes). In this case 1 byte, because all DateTimeKind values are in the range of fixnum.

Or you could also choose to directly write the enum as fixnum for extra speed using out.WriteByte (Format.fixposnum (int dt.Kind)) since we can be sure of this enum's range. I used it for union tags

Fable.Remoting/Fable.Remoting.MsgPack/Write.fs

Lines 254 to 259 in c65f604

	let inline writeUnion union (out: Stream) (caseSerializers: Action<'a, Stream>[][]) tagReader =
	let tag = tagReader union
	let fieldSerializers = caseSerializers.[tag]
	out.WriteByte (Format.fixarr 2uy)
	out.WriteByte (Format.fixposnum tag)

Yes, it will go up in flames as soon as someone tries to deserialize a union with more than 127 cases (and they'd deserve it! 😂).

[Zaid-Ajaj]

Thanks a lot for the explanation and for reviewing @kerams if the way I handled DateTimeKind isn't problematic and works correctly, I will leave it as is. Let's get this in and publish a new batch 😄

[kerams]

Unfortunately, MsgPack also depends on TypeShape, so it'll need to be included there too.