Laravel conditional validation

I have a form with 2 numeric fields: kg_bags and g_bags.

At least one of them is required, and must be greater than Zero.

My validation:

$this->validate($request,[
"kg_bags" => "bail|required_without:g_bags|required_if:g_bags,'<=',0|numeric|min:1",
"g_bags" => "bail|required_without:kg_bags|required_if:kg_bags,'<=',0|numeric|min:1"
],
[
 'kg_bags.required_if' => 'Please fill in the number of bags you packed',
 'kg_bags.required_without' => 'Please fill in the number of bags you packed',
 'kg_bags.min' => 'How did you pack less than Zero bags?',
 'g_bags.required_if' => 'Please fill in the number of bags you packed',
 'g_bags.required_without' => 'Please fill in the number of bags you packed',
 'g_bags.min' => 'How did you pack less than Zero bags?'
]);

This does not work as I want.

If I submit:

kg_bags = empty

g_bags = -1

I get the error: kg_bags must be numeric instead of: How did you pack less than Zero bags?

Why is that?

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