A primary key value: a scalar string, a scalar number, or a composite
key expressed as a readonly record of named columns to values.
A composite key is a record, never an array, because a composite key is
named columns and an array would force the caller to depend on a column
order the mapping owns. The scalar arms are retained so every existing call
site and every existing adapter keeps compiling.
A primary key value: a scalar
string, a scalarnumber, or a composite key expressed as a readonly record of named columns to values.A composite key is a record, never an array, because a composite key is named columns and an array would force the caller to depend on a column order the mapping owns. The scalar arms are retained so every existing call site and every existing adapter keeps compiling.