See Changelog.

Bug fixes for regressions and new features in v1.8

• allow elements of Config.field to update elements of a Field, #2461 by @samuelcolvin
• fix validation with a BaseModel field and a custom root type, #2449 by @PrettyWood
• expose Pattern encoder to fastapi, #2444 by @PrettyWood
• enable the Hypothesis plugin to generate a constrained float when the multiple_of argument is specified, #2442 by @tobi-lipede-oodle
• Avoid RecursionError when using some types like Enum or Literal with generic models, #2436 by @PrettyWood
• do not overwrite declared __hash__ in subclasses of a model, #2422 by @PrettyWood
• fix mypy complaints on Path and UUID related custom types, #2418 by @PrettyWood
• Support properly variable length tuples of compound types, #2416 by @PrettyWood