Module table 

Rows built a column at a time, handed over as a DataFrame a batch at a time.

The GPS readers know each column’s type up front (or, for a GPX extension field, hold it as text), so they fill plain vectors and never ask Polars to infer.

Structs

Builder

Columns being filled, a row at a time.

Enums

Cell

One value of a row, of the column’s kind; None is null.

Kind

The type of one column.