Interface QwpWriterColumn<T, DesignatedTimestamp>

Carries the input type without adding a runtime value. Never assigned, and deliberately a plain property rather than a unique symbol: each emitted bundle would declare its own symbol, making the key nominally distinct per entry point. A column built by './qwp' would then satisfy another bundle's QwpWriterColumn without ever matching its phantom key, so QwpWriterColumnInput would infer unknown and every row field would silently accept anything. A shared property name resolves structurally across bundles, which is what keeps row typing alive for consumers of the published package.

GEOHASH precision in bits, fixed for the whole column.

DECIMAL scale, fixed for the whole column.