Use single quote for long format syntax

[JCEmmons]

According to http://goessner.net/articles/JsonPath/ , bracket notation for a given path uses single quote, not double quote. So in your examples:

Instead of

$.baz[\"π\"]

isn't a valid key. It should be really be

$.baz['π']

Actually, there's no specific need to force the long form just because there's a non-ASCII character
in the key.

I'm pretty sure that

$.baz.π

is a perfectly legit key.