Module span 

Structs

Span

Enums

SpanKey

Constants

NO_END

Functions

col_index_to_letter

Converts a 0-based column index back to Excel-style letter(s). 0 → “A”, 25 → “Z”, 26 → “AA”, etc.

span_a2i

Gets an index based on a column letter e.g. A = 0. Now case-insensitive (accepts both “B” and “b”).