Function itemMatchesFilter

Tells whether an item matches a single filter. Both the value of the field and the value of the filter go through the comparer of the options (see toComparableValue) before being compared:

• equal, notEqual, in, notIn: by === on the comparables;
• equalInsensitive: like equal, ignoring the case whatever the options;
• greaterThan, greaterThanOrEqual, lessThan, lessThanOrEqual: by < / >, never matching an unset value on either side;
• range: between min and max, each excluded when exclude is true, open when null; never matching an unset value;
• contains, notContains: substring of a string, membership of a list;
• startsWith, endsWith: on the text of the values.

With options.nullSemantics "sql", an unset field never matches notEqual, notIn nor notContains; see InMemoryNullSemantics.