If one is looking through Unicode text and wants to compare a given rune with
some literal value like '.' or ',', is there any easy way of declaring ASCII
char values as Rune literals so that they can be compared more readably than
doing `if some_rune == Rune('.')` or similar? Something like Python 2's
`u'foo'` prefix? I couldn't see anything in the tutorials about this.
Alternatively, something like Python's `from __future__ import
unicode_literals`, only that applies to entire modules and one might want to
just enable it locally for a single proc or a block within a proc.
