fix(runtime): longCast unboxes a boxed ulong as ulong, not long - #33
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longCast(object) now returns the ulong local its type check already produced instead of unboxing the box a second time as Int64, which the CLR rejects for a UInt64 box. Casting any boxed ulong threw InvalidCastException, and intCast(object) delegates here, so (int ...) failed the same way.
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Closes #31
RT.longCast(object)returns theulonglocal its type check produced instead of unboxing theUInt64box asInt64, which the CLR rejects, so(long x)and(int x)on a boxedUInt64convert instead of throwingInvalidCastException.