Our indexmap dependency needs at least this version.

    error[E0658]: use of unstable library feature 'vec_drain_as_slice': recently added
        --> github.com-1ecc6299db9ec823/indexmap-1.8.0/src/map.rs:1182:30
         |
    1182 |         let iter = self.iter.as_slice().iter().map(Bucket::refs);
         |                              ^^^^^^^^

    error[E0658]: use of unstable library feature 'vec_drain_as_slice': recently added
       --> github.com-1ecc6299db9ec823/indexmap-1.8.0/src/set.rs:842:30
        |
    842 |         let iter = self.iter.as_slice().iter().map(Bucket::key_ref);
        |                              ^^^^^^^^

rust-lang/rust-clippy#8285

    error: this method is named `iter` but its return type does not implement `Iterator`
       --> src/map.rs:238:5
        |
    238 |     pub fn iter(&self) -> Iter {
        |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
        |
        = note: `-D clippy::iter-not-returning-iterator` implied by `-D clippy::pedantic`
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#iter_not_returning_iterator

    error: this method is named `iter_mut` but its return type does not implement `Iterator`
       --> src/map.rs:246:5
        |
    246 |     pub fn iter_mut(&mut self) -> IterMut {
        |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#iter_not_returning_iterator

Deserialize small numbers as integers in arbitrary_precision

Closes #850.

Closes #578.

Before:

    error: expected item, found `"serde_json requires that either `std` (default) or `alloc` feature is enabled"`
     --> src/features_check/error.rs:1:1
      |
    1 | "serde_json requires that either `std` (default) or `alloc` feature is enabled"
      | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected item

    error[E0407]: method `visit_string` is not a member of trait `Visitor`
       --> src/raw.rs:455:5
        |
    455 |       fn visit_string<E>(self, s: String) -> Result<Self::Value, E>
        |       ^  ------------ help: there is an associated function with a similar name: `visit_str`
        |  _____|
        | |
    456 | |     where
    457 | |         E: de::Error,
    458 | |     {
    459 | |         Ok(RawValue::from_owned(s.into_boxed_str()))
    460 | |     }
        | |_____^ not a member of trait `Visitor`

    error[E0046]: not all trait items implemented, missing: `collect_str`
        --> src/ser.rs:1376:1
         |
    1376 | impl<'a, W: io::Write, F: Formatter> ser::Serializer for RawValueStrEmitter<'a, W, F> {
         | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `collect_str` in implementation
         |
         = help: implement the missing item: `fn collect_str<T>(self, _: &T) -> core::result::Result<<Self as serde::Serializer>::Ok, <Self as serde::Serializer>::Error> where T: Display { todo!() }`

    error[E0046]: not all trait items implemented, missing: `collect_str`
       --> src/value/ser.rs:864:1
        |
    864 | impl serde::ser::Serializer for RawValueEmitter {
        | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `collect_str` in implementation
        |
        = help: implement the missing item: `fn collect_str<T>(self, _: &T) -> core::result::Result<<Self as serde::Serializer>::Ok, <Self as serde::Serializer>::Error> where T: Display { todo!() }`

    error[E0599]: no method named `visit_string` found for struct `BoxedFromString` in the current scope
       --> src/raw.rs:452:14
        |
    428 | pub struct BoxedFromString;
        | --------------------------- method `visit_string` not found for this
    ...
    452 |         self.visit_string(s.to_owned())
        |              ^^^^^^^^^^^^ method not found in `BoxedFromString`

After:

    error: expected item, found `"serde_json requires that either `std` (default) or `alloc` feature is enabled"`
     --> src/features_check/error.rs:1:1
      |
    1 | "serde_json requires that either `std` (default) or `alloc` feature is enabled"
      | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected item

Currently fails with:

    ---- test_raw_value_in_map_key stdout ----
    thread 'test_borrowed_raw_value' panicked at 'called `Result::unwrap()`
    on an `Err` value: Error("invalid type: newtype struct, expected any
    valid JSON value", line: 1, column: 2)', tests/test.rs:2230:52

Support deserializing map key as &RawValue