The following functions provide duplicate functionality that is available through the namespaced libraries or operators which may also offer better performance:
Abs by math.absAcos by math.acosAsin by math.asinAtan2 by math.atan2Ceil by math.ceilChar by string.char, utf8.charCos by math.cosFabs by math.fabsFloor by math.floorFrand by math.randomGetDate by os.dateGetListLength by #tableGetTime by os.clockGetTimestamp by os.dateGetUnixTime by os.timeLog by math.logLog10 by math.log10ModPow by (a^b)%cOrd by string.byte, utf8.codepointPow by math.powRot2Fwd by quaternion.tofwdRot2Left by quaternion.toleftRot2Up by quaternion.toupRound by math.roundSin by math.sinSqrt by math.sqrtStringLength by #string, string.len, utf8.lenTan by math.tanToLower by string.lowerToUpper by string.upperVecDist by vector.magnitude(v1 - v2)VecMag by vector.magnitudeVecNorm by vector.normalize