Std.MultiKeyMap.insert

fn

This is a callable function.

What it does

The map with an entry added or replaced.

The indexes only gain an entry when the key is new. Replacing a value leaves

them alone, because the pair they record is unchanged — recording it twice

would make a later removal drop only one of the copies and leave the index

claiming a key the entries no longer hold.

Read the signature

• The text after the name is the type checked by Pudu.
• Read arrows from left to right: inputs come first, and the final type is returned.
• & borrows a value for this call instead of moving or copying it.
• Names inside [ ] are type arguments, such as the item type held by a collection.