dojo.cache improperly resolves already-resolved paths

[Rawld Gill]

The following usage of dojo.cache fails:

dojo.cache(require.toUrl("myModule/templates/template.html"));

[Rawld Gill]

(In [25223]) fixed argument cracking for dojo.cache; fixes #13095

[Rawld Gill]

Version 1.6- had the following signatures

1. (module(string), url(string) [, value])
2. (module(object) [, value])

version 1.7+ adds the following signature

3. (path(string) [, value])

3 allows, e.g.,

dojo.cache(require.toUrl("myModule/templates/myTemplate.html"));

both with and without a value argument (the second argument is always a value and never a url).

Notice that (string, string) satisfies both 1 and 3. To resolve the ambiguity, notice further that in 1, the module string will never contain slashes whereas in 3 path will always contain slashes. Use this fact to decode real signature.