docs: list the types that are known to work for each template parameter

Follow up on the template parameter requirements page: state, for every
template parameter, which concrete types work and where they stop working.
Each entry was verified by compiling and running a common workload (DOM
access, dump, parse, CBOR/MessagePack round-trip, flatten, hash) against that
instantiation.

Findings worth calling out:

- ObjectType no longer needs a key_compare member type, so the std::unordered_map
  adapter only has to restore the template argument order. A hash-ordered
  ObjectType works everywhere except unflatten(), which reconstructs an array
  only when it meets the reference token 0 before the other indices.
- ArrayType: std::deque works when wrapped to add capacity(); std::list does not.
- StringType: std::pmr::string and std::basic_string with a custom allocator
  compile for the DOM, dump, and parse, but not for the binary readers, flatten,
  or diff, because the library assigns std::string values to string_t and
  int_to_string cannot be overloaded for a type in namespace std.
- NumberFloatType: long double works for dump and parse but not for the binary
  formats, which have no encoding for it.
- BinaryType: std::vector<std::byte> supports assignment, get, and the binary
  formats, but neither dump nor std::hash<basic_json>.

Also record the object_comparator_t fix in its version history.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018hxZxz8svM54c6ATEvXp5E
Signed-off-by: Niels Lohmann <mail@nlohmann.me>

docs/mkdocs/docs/api/basic_json/binary_t.md

@@ -52,6 +52,13 @@ represent a byte array in modern C++.
 
 The default values for `BinaryType` is `#!cpp std::vector<std::uint8_t>`.
 
+#### Supported byte types
+
+`#!cpp std::vector<std::uint8_t>` and `#!cpp std::vector<char>` are fully supported. With
+`#!cpp std::vector<std::byte>`, assignment, [`get`](get.md), and the [binary formats](../../features/binary_formats/index.md)
+work, but [`dump`](dump.md) and [`std::hash<basic_json>`](std_hash.md) do not compile, because `#!cpp std::byte` neither
+converts to an integer nor is hashable as one.
+
 #### Custom BinaryType behavior
 
 When a custom `BinaryType` is configured (other than the default `#!cpp std::vector<std::uint8_t>`), you can assign