Property key for Projection fields that assigns a result name to a computed Expression, in the
{name}={expression} form. A Projection key always carries the =, keeping the binding key space disjoint from
the plain Identifier keys of a Template (see Projection).
Named computed expression.
Property key for Projection fields that assigns a result name to a computed Expression, in the
{name}={expression}form. AProjectionkey always carries the=, keeping the binding key space disjoint from the plain Identifier keys of a Template (see Projection).