Hamish Friedlander 1ed41b8d67 API Prep ArrayList for immutability in 3.1 per 7673
ArrayList had several methods that should act on a copy and return
that copy, but was instead mutating the existing list.

We cant change this behaviour in the 3.0 line for backwards compt.
reasons, but this makes the desired behavior the default, and
makes disabling the mutation in 3.1 easier
2012-07-20 14:55:44 +12:00
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