merged branch nikic/improveIsDefinedPerformanceInNonStrictMode (PR #381)

Commits
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e4b8371 Improve performance of is defined in non strict mode

Discussion
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Improve performance of is defined in non strict mode

Addresses issue #380: This gives a good performance improvement on defined tests in non-strict code. About 2x.

Reasoning: It doesn't make sense to propagate the `is_defined_test` flag into deeper levels in non-strict mode, because all getAttr functions and name accesses will just return `null` if it doesn't exist and `null` is just as good as `false`.

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by nikic at 2011/07/02 03:22:53 -0700

Though, do not merge yet please. Changes behavior concerning methods.

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by nikic at 2011/07/02 13:34:32 -0700

Hm, I really don't know what I was thinking when I wrote my last comment. There shouldn't be any behavior changes introduced by that change (and tests pass).