Function fit_map 

pub fn fit_map<K: Ord, V>(
    at: usize,
    value: BTreeMap<K, V>,
    bound: usize,
    behaviour: TryConstruct,
) -> Result<Narrowed<BTreeMap<K, V>>, WireError>

A map that has been read whole, against the receiver’s bound.

Table 11 names map among the forms a TRIM may be written on — “string, wide string, sequence, or map” — and Table 17’s MAP_TYPE row carries the same O2.length <= T1.length the SEQUENCE_TYPE row does, counted in entries.

§7.3.1.2.1.12.3 takes the first elements. A map has no declaration order once it is in an ordered container, so the first bound entries are the bound smallest keys — which is the same rule crate::Writer::write_map writes under and not a second one.

Errors

As fit_string.