Normalize an attribute value for a Kepler column of type.
Timestamps are normalized to epoch milliseconds (Kepler's x format) so
temporal filters and animation windows are exact in both directions.
Nested objects/arrays reaching a string column are JSON-stringified and
recorded as a nested-value-stringified loss by the caller.
Normalize an attribute value for a Kepler column of
type.Timestamps are normalized to epoch milliseconds (Kepler's
xformat) so temporal filters and animation windows are exact in both directions. Nested objects/arrays reaching astringcolumn are JSON-stringified and recorded as anested-value-stringifiedloss by the caller.