This project proposes to support read-only and practical immutable values in Go.

Versions:

• the proposal thread (the old one 1, the old one 2), and the golang-dev thread
• v0: the initial proposal
• v1: the var:N version
• v2: the pure-immutable-value interpretation version
• v3: the immutable-type interpretation version
• v4: the immutable-type/value interpretation version: const+fixed
• v5: the immutable-type/value interpretation version: final+fixed. With interface design flaw
• v6: final+fixed. Without partial read-only
• v7: final+fixed. With partial read-only
• v8: const+reader/writer roles. Partial read-only removed
• v9.0: final+reader/writer roles
• v9.1: final+reader/writer roles. Disallows passing writer values as reader arguments.
• v9.a, reader + read-only values. Removes final values concept.