Conversion between byte and Integer is not sign-proof

[FroMage]

I'm pretty sure we want bytes to appear as unsigned bytes in Ceylon, so when converting from byte to Integer we should make sure we get a value between 0:255 rather than the current -127:128 (give or take 1)

[FroMage]

Moving to M5

[FroMage]

I tried to do this, but it isn't trivial and would require more testing, and we have a relatively easy workaround so I would move it to M6.

[FroMage]

I think the discussions around the usefulness of better support for bytes are for 1.2, so moving this one.

[quintesse]

Besides I was thinking, couldn't we support conversions from Integer in the range of -127:255? That way you could convert both signed and unsigned numbers. (leaving this comment for when we pick this up again)