deepmerge(t: T, p: Partial<T>) results in an inferred Partial<T> instead of a T

Incorrect type inference for nested optional properties

Merging non-Partial with Partial results in Partial

Incorrect type inference for a field that is not optional, but has type of a union with undefined

Merge non-existing fields

deepmergeIntoCustom returns undefined

Enable auto JSR releases

Mutating new object mutates the original object

Compilation error on index.d.cts

Remove Array.at