pub fn normalize_date_bound(value: &str) -> Option<String>Expand description
Normalizes a date bound into the YYYYMMDD form the report keys use.
Reports compare bounds against row keys as plain strings, so a value that is
not one of the two documented formats, or that is not a real calendar date,
would silently turn the filter into a no-op or drop every row. Returns
None for those values so callers can reject them.