Double precision (64-bit) floating-point numbers in IEEE 754 representation
public let pi : Float
public let e : Float
public func isNaN(number : Float) : Bool
public func format(fmt : {#fix : Nat8; #exp : Nat8; #gen : Nat8; #exact}, x : Float) : Text
public let toText : Float -> Text
public let toInt64 : Float -> Int64
public let fromInt64 : Int64 -> Float
public let toInt : Float -> Int
public let fromInt : Int -> Float