I’m not sure what to write, tho. I don’t understand ‘fract’ 
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When changed descriptions for Vector3 and Vector4, floor and fract would also need changing.
How about
/**
* Gets a new Vector2 from current Vector2 floored values
* eg (1.2, 2.31, 1.54) returns (1, 2, 1)
* @returns a new Vector2
*/
public floor(): Vector2 {
return new Vector2(Math.floor(this.x), Math.floor(this.y));
}
/**
* Gets a new Vector2 from current Vector2 fractional values
* eg (1.2, 2.31, 1.54) returns (0.2, 0.31, 0.54)
* @returns a new Vector2
*/
public fract(): Vector2 {
return new Vector2(this.x - Math.floor(this.x), this.y - Math.floor(this.y));
}
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Clear, like it.
Are you OK to do a PR?
Yes, sure 
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