[9.x] Fix BelongsToMany#updateOrCreate behaviour merge arguments for new models #35827
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This fixes an issue with that the behavior of the
updateOrCreate
method on BelongsToMany relationships is not merging the$attributes
and$values
arrays.This is different from the behaviour of the
updateOrCreate
methods onBuilder
,HasOneOrMany
andHasManyThrough
classes and from the documented behavior "If no such flight exists, a new flight will be created which has the attributes resulting from merging the first argument array with the second argument array" eloquent#upserts.Fixes #35798