Lots of `Deprecated` warning in the current version of PHP.

[midnight-wonderer]

Hi, I'm trying out the package today, and I was wondering: Is it still maintained?
Upon installing it, I received the following warnings:

Deprecated: Krak\Fun\... (Click to expand)

Deprecated: Krak\Fun\dd(): Implicitly marking parameter $dump as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/fn.php on line 112

Deprecated: Krak\Fun\dd(): Implicitly marking parameter $die as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/fn.php on line 112

Deprecated: {closure:Krak\Fun\retry():767}(): Implicitly marking parameter $t as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/fn.php on line 767

Deprecated: {closure:Krak\Fun\retry():774}(): Implicitly marking parameter $t as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/fn.php on line 774

Deprecated: Krak\Fun\stack(): Implicitly marking parameter $last as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/fn.php on line 811

Deprecated: Krak\Fun\stack(): Implicitly marking parameter $resolve as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/fn.php on line 811

Deprecated: Krak\Fun\Curried\dd(): Implicitly marking parameter $dump as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/curried.generated.php on line 139

Deprecated: Krak\Fun\Curried\dd(): Implicitly marking parameter $die as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/curried.generated.php on line 139

Deprecated: {closure:{closure:Krak\Fun\Curried\retry():696}:698}(): Implicitly marking parameter $t as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/curried.generated.php on line 698

Deprecated: {closure:{closure:Krak\Fun\Curried\retry():696}:707}(): Implicitly marking parameter $t as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/curried.generated.php on line 707

Deprecated: Krak\Fun\Curried\stack(): Implicitly marking parameter $last as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/curried.generated.php on line 725

Deprecated: Krak\Fun\Curried\stack(): Implicitly marking parameter $resolve as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/curried.generated.php on line 725

Deprecated: Krak\Fun\c\dd(): Implicitly marking parameter $dump as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/c.generated.php on line 139

Deprecated: Krak\Fun\c\dd(): Implicitly marking parameter $die as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/c.generated.php on line 139

Deprecated: {closure:{closure:Krak\Fun\c\retry():696}:698}(): Implicitly marking parameter $t as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/c.generated.php on line 698

Deprecated: {closure:{closure:Krak\Fun\c\retry():696}:707}(): Implicitly marking parameter $t as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/c.generated.php on line 707

Deprecated: Krak\Fun\c\stack(): Implicitly marking parameter $last as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/c.generated.php on line 725

Deprecated: Krak\Fun\c\stack(): Implicitly marking parameter $resolve as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/c.generated.php on line 725

Deprecated: Krak\Fun\f\dd(): Implicitly marking parameter $dump as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/f.generated.php on line 105

Deprecated: Krak\Fun\f\dd(): Implicitly marking parameter $die as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/f.generated.php on line 105

Deprecated: {closure:Krak\Fun\f\retry():745}(): Implicitly marking parameter $t as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/f.generated.php on line 745

Deprecated: {closure:Krak\Fun\f\retry():754}(): Implicitly marking parameter $t as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/f.generated.php on line 754

Deprecated: Krak\Fun\f\stack(): Implicitly marking parameter $last as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/f.generated.php on line 790

Deprecated: Krak\Fun\f\stack(): Implicitly marking parameter $resolve as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/vendor/krak/fn/src/f.generated.php on line 790

If it is abandoned, what are some good alternatives you would recommend?