pub fn parse_size(text: &str) -> Result<usize, SizeError>
A typed sample size: 50000, 50,000, 50_000, 50k, 2m, 2.5M. A size of no rows is refused; past usize it saturates and the caller clamps.
50000
50,000
50_000
50k
2m
2.5M
usize