//! IMAP wire codec: parsing server responses and encoding client commands.
//!
//! # References
//! - RFC 3501 (`IMAP4rev1`)
//! - RFC 9051 (`IMAP4rev2`)
//! - RFC 2047 (MIME encoded words in ENVELOPE fields)
//! - RFC 2231 (MIME parameter encoding in BODYSTRUCTURE)
//! - RFC 6855 (UTF8=ACCEPT — raw UTF-8 in quoted strings)
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