S.I/Lisp/

CONTAINS

=CONTAINS("Spreadsheet Lisp", "Lisp")
-> TRUE
        

DEFINE(
    CONTAINS,
    LAMBDA(
        haystack,
        needle,
        IF(
            AND(
                EQUAL(
                    COUNTA(haystack),
                    1),
                EQUAL(
                    COUNTA(needle),
                    1)),
            ISNUMBER(
                SEARCH(
                    needle,
                    haystack)),
            OR(
                EXACT(
                    needle,
                    haystack)))))
        

Help us optimize this function