Add a constraint when interpreting $argv.

Before, if an entry in $argv contains a “=”, it was considered as an
option/switch. It could lead to an error when an input contains a “=”
symbol. We add a constraint to fix this.
[auto] Merge from Router

    • #8606e66 — Add a constraint when interpreting $argv. (Ivan Enderlin, 2013-07-12)

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Merge remote branch 'library-router/master'