I have the following class with a primary construc...

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I have the following class with a primary constructor data class Vec2i(override var x: Int, override var y: Int) : Vec2t<Int>()
and then a secondary constructor, referring to the first one constructor(x: Number, y: Number) : this(x.i, y.i)

No problems in kotlin, but in java it complains constructor is ambiguous... why this behavious difference?