CONV's radix argument out of range (>36) silently produces garbage

SELECT CONV('10', 37, 10);

-- MariaDB: 37    <-- computes with 37 as a valid radix ('10' base37 = 37)

-- MySQL:   NULL

SELECT CONV('10', 10, 37);

-- MariaDB: A     <-- '10' of base 37 = 1*37+0 = 37 = 'A' of base 37

-- MySQL:   NULL