Variants do not override base styles

[alex-buena]

Describe the bug
I you have a style in the base and then in the variants it does not get overridden. Only is u use !

To Reproduce

const buttonVariants = tv({
  base: 'ui:px-md ',
  variants: {
size: {
      xl: ['ui:px-lg'],
}
})

-> px will be md

Expected behavior
That variants are stronger then the base

Desktop (please complete the following information):

• OS: Mac Os
• Browser chrome]
• Version [e.g. 22]

"tailwind-variants": "^3.1.1"
"tailwindcss": "^4.1.5",
"@tailwindcss/cli": "^4.1.5",