[swift-dev] Why are BinaryFloatingPoint's RawSignificand and RawExponent different type?

[Jens Persson]

I can understand why
Double.RawSignificand is UInt64
and
Float.RawSignificand is UInt32

But I can't understand why both
Double.RawExponent
and
Float.RawExponent
should be UInt.

Why aren't they also just UInt64 and UInt32, resp.?

/Jens
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