i;ascii-numeric

[3] RFC 2244 - ACAP -- Application Configuration Access Protocol, 2021-04-11T10:25:16.000Z, 2021-04-21T09:50:14.643Z https://tools.ietf.org/html/rfc2244#page-16

[1] RFC 5231 - Sieve Email Filtering: Relational Extension (2015-11-29 17:36:49 +09:00 版) https://tools.ietf.org/html/rfc5231#section-3

The "i;ascii-numeric" comparator, as defined in [RFC4790], MUST be
supported for any implementation of this extension. The comparator
"i;ascii-numeric" MUST support at least 32-bit unsigned integers.
Larger integers MAY be supported. Note: the "i;ascii-numeric"
comparator does not support negative numbers.

[2] RFC 5260 - Sieve Email Filtering: Date and Index Extensions (2017-05-07 22:48:17 +09:00) https://tools.ietf.org/html/rfc5260