Function filterToBusinessDays

filterToBusinessDays(
    dates: string[],
    columns: number[][],
    countries: string | string[],
): { columns: number[][]; dates: string[] }
Filters (dates, columns) to retain only rows where the date is a business day. Preserves alignment across all columns.
Parameters
- dates: string[]
- columns: number[][]
- countries: string | string[]
Returns { columns: number[][]; dates: string[] }
- Defined in src/bizcalendar.ts:186