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inconsistent math functions


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I just solved a bug in my app and the reason for the bug was, that i was expecting Matrix.invert() to return an inverted copy of the matrix but the matrix itself gets modified.
This is a bit confusing because most other functions return a copy.
For example Vector3.negate() returns a copy ... but Vector3.normalize() does not.

I think a function should always return a copy here. The "InPlace" version should be added for direct modification.
But i think because of compatibility this can't be changed. Maybe all those special cases should be documented (Intellisense). At the moment i always need to look at the sources to make sure that i use the functions correctly.

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