Bah! Any pattern that mentions a scant 1/4 is banished from my life. Since that measurement can't be defined it is worthless.
I also don't fret if I can't exactly meet the given dimensions of a pattern. For the most part (I said MOST not all) it just doesn't matter.
I can't imagine my grandmother sitting at her treadle worrying if she is sewing a scant 1/4" - or a precise 1/4" either and she produced some amazing quilts!
This is a hobby to be enjoyed, not to get tangled up in stuff that gives people stress.