Better performances when lexing a big text.

Avoid copying text (even if PHP applies the COW principle
—copy-on-write—), and manipulate references to token namespaces.
[auto] Merge from Compiler

    • #1a0b8b2 — Better performances when lexing a big text. (Ivan Enderlin, 2013-02-18)

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Merge remote branch 'library-compiler/master'