Type guard that narrows a string to ArtccStratum when it matches a member of ARTCC_STRATA.
Useful when consuming external strings (URL params, config files, MCP tool inputs) that should be validated before being used as an ARTCC stratum filter.
The string to test.
true if value is a valid ArtccStratum.
true
value
ArtccStratum
Type guard that narrows a string to ArtccStratum when it matches a member of ARTCC_STRATA.
Useful when consuming external strings (URL params, config files, MCP tool inputs) that should be validated before being used as an ARTCC stratum filter.