Hi Evolution,

I was wondering if we would consider adding a percentage type to Swift.  This 
would be a type with a value between 0 & 1.

I know we can and do use doubles or floats for this now, but there really is a 
semantic difference between most parameters that take a value between 0 & 1 and 
those that take any floating point value.  It would be nice to have a type that 
semantically means that the value is from 0 to 1.

It could even just wrap a Double for speed (in my own code I wrap a UInt64 for 
decimal accuracy… and to avoid issues around comparisons).

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