restricted-text 0.0.0

This is not yet even an early experiment! The Restricted Text format is actively evolving and the code doesn't work at all yet!

restricted-text defines several utilities for working with a subset of Unicode called Restricted Text:

• RestrictedString and RestrictedStr are similar to TextString and TextStr using Restricted Text. Restricted Text excludes some forms of visual ambiguity.

• RestrictedReader and RestrictedWriter are input and output streams which use the Restricted Text format. On input and output, non-restricted content is diagnosed as errors.

• RestrictedDuplexer is a Duplex for reading and writing on an interactive stream using Restricted Text.