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Made sure that operations internal to Project could not generate these warnings by adding a new setPropertyInternal method that didn't do any checks.
Also made the getUserProperties and getProperties methods return copies of maps rather than direct references.
Updated WHATSNEW to warn about these issues.
Added some unit tests to verify that property immutability is enforced - where we actually do enforce it ;)
Submitted by: "Erik Hatcher" <jakarta-ant@ehatchersolutions.com>
git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@270078 13f79535-47bb-0310-9956-ffa450edef68