RFC: extend identifiers to support non-ASCII characters.

I like the concept of GraphQL, but I'm really surprised by the ASCII-limitation in the spec. Many years ago, that limitation made sense, but today it sounds like a blast from the past where lots of standards and tools only catered to English speaking users.
Nowadays many database engines etc support non-ASCII characters in field and table names etc, making it a lesser experience for users of tools like graphiql if the names they see there has to be "escaped/uglified" versions of the real names.