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整数リテラルは Int になる。*literalConvertible 的なものはない？暗黙的型変換がないとのこと。型変換するときはメソッドを使う。Swift と違い、変換元の方が変換の責任を持っているように見える。
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| val i: Double = 1 // 型 error | |
| val i_: Double = 1.toDouble() |
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Number とは別に Comparable を準拠している
Double private constructor() : Number(), Comparable
public interface Comparable