attr's argument's length may be changed

[lining041038@…]

when some other js code override attr function, it may be always send arguments more the one, then code's behind: return jQuery.access( this, jQuery.attr, name, value, arguments.length > 1 ); will go not correctly, i view this problem when i use tinymce fulltext components and when i use like $("a").attr("class"), it will be deal as chainable. the other auguments will be undefined. it has no problem in jquery version 1.6.2. i don't know if it should let other changing their code or change the jquery core.

[Rick Waldron]

Duplicate of #11527.