extensions: ignore "sub-options" when looking for extensions
config suboptions are separated by ":" (see the path one for example). So we
dont want to confuse these config with actual extensions.
We don't have extensions sub option yet, but I am about to introduce one for
making sure an extensions can load. So lets level the floor first.
Differential Revision: https://phab.mercurial-scm.org/D11819
{
// Enforcing
"eqeqeq" : true, // true: Require triple equals (===) for comparison
"forin" : true, // true: Require filtering for..in loops with obj.hasOwnProperty()
"freeze" : true, // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
"nonbsp" : true, // true: Prohibit "non-breaking whitespace" characters.
"undef" : true, // true: Require all non-global variables to be declared (prevents global leaks)
// Environments
"browser" : true // Web Browser (window, document, etc)
}