`FREQ=DAY` => `FREQ=DAILY`
`FREQ=DAY` => `FREQ=DAILY`

`FREQ=DAY` is `undefined` after parsing
amyhua/rrule,Ribeiro/rrule,clochix/rrule,clochix/rrule,nehakadam/rrule,teambition/rrule,bendavis78/rrule,teambition/rrule,Ribeiro/rrule,psnider/rrule,TeamPraxis/rrule,psnider/rrule,TeamPraxis/rrule,jkbrzt/rrule,moisadoru/rrule,nehakadam/rrule,jkbrzt/rrule,bendavis78/rrule,amyhua/rrule,moisadoru/rrule