SYNOPSIS
        mapping m_add(mapping map, mixed key, [mixed data...])

DESCRIPTION
        Add (or replace) an entry with index <key> in mapping <map>.
        The modified mapping is also returned as result.

        The values for the entry are taken from the <data> arguments.
        Unassigned entry values default to 0, extraneous <data> arguments
        are ignored.

        The difference between m_add() and the operator += is that the
        latter creates a duplicate of the target mapping if it has
        several references (see EXAMPLES).

EXAMPLES
        mapping m;

        m = ([ "foo" ]);
        m_add(m, "bar", 1) --> ([ "foo", "bar" ])

        m = ([ "foo":1 ]);
        m_add(m, "bar", 1) --> ([ "foo":1, "bar":1 ])

        m = ([ "foo":1;2 ]);
        m_add(m, "bar", 1) --> ([ "foo":1;2, "bar":1;0 ])
        m_add(m, "baz", ({ 4, 5 })... )
          --> ([ "foo":1;2, "bar":1;0, "baz":4;5 ])

HISTORY
        Introduced in LDMud 3.2.9.

SEE ALSO
        mappingp(E), mkmapping(E), m_delete(E), m_entry(E), m_indices(E),
        m_values(E), sizeof(E), widthof(E)