patchbomb: ensure all headers and values given to email mod are native strings
This lets test-patch-bookmark.t only fail with some harmless header
output changes on Python 3, so I think patchbomb might be basically
useful on Python 3 now.
Differential Revision: https://phab.mercurial-scm.org/D3952
{
// 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)
}