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• This request isn't a duplicate of an existing issue
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Description

Unexpected behaviors when using integers or numeric strings as keys

Steps to reproduce

// Without declare(strict_types=1); !!
Config::define(999, 'nine nine nine');
Config::apply();

Expected behavior:

Warn (or throw exceptions) about using integers or numeric strings as keys is incorrect.

Actual behavior:

echo Config::get(999);
==> nine nine nine

echo constant(999);
==> nine nine nine

echo constant('999');
==> nine nine nine

echo 999;
==> 999

Possible Solution

• Bump PHP requirement
• Add declare(strict_types=1);
• Add type hints