New feature

@rjsf/core

Fixed a schema prop change being silently dropped when it adds a property with a default, either as the parent's reply to onChange or at any point after a change to an uncontrolled form. The guard that keeps a oneOf/anyOf option switch from reverting now only applies when the form re-derives its own formData (an uncontrolled form, or a parent holding what onChange emitted, including when it reshaped the emitted value by spreading it, storing undefined as null or round-tripping it through JSON) with the same schema and experimental_defaultFormStateBehavior, and it keeps only that formData rather than dropping the rest of the prop update, fixing #5294
Fixed switching between oneOf/anyOf options keeping a value the previous option's default put there, so a property whose value still matches that default, or a whole option that does, now picks up the new option's default the way a scalar property already did, and switching back to an option restores its own defaults. A property the new option cannot hold as it stands now picks the new default up as well instead of arriving empty — one whose type differs between the options, or a readOnly one edited away from its default. Values are compared whole, so a nested object the user has partly edited keeps the rest of the old option's defaults, and a value equal to the old default is replaced no matter who supplied it, including one passed in formData, since the two cannot be told apart, fixing #4476

Updated Experimental_DefaultFormStateBehavior to add a new requiredBooleanDefault option, and updated getDefaultFormState() to honor it: skip turns off the false populated for a required boolean with no default (introduced in 6.9.0 by #5170), so a form that models an unanswered boolean as its own state can keep it undefined and let required report it. The default, populateFalse, keeps the 6.9.0+ behavior

Updated ata-validator from ^1.7.1 to ^1.23.0, picking up the corrected error shape for unevaluatedProperties (the error now carries params.unevaluatedProperty), the removal of a quadratic in additionalProperties: false schemas with many properties, a fix for a hang on truncated JSON input, and enforced strict-mode schema checks (#5293)

Documented the requiredBooleanDefault option in form-props.md and internals.md, and added a selector for it to the playground