Regression: unable to unset border-width

[sophstad]

This works when border is set to a full border property like 1px solid black, but not a keyword like inherit.

Code

import { CSSStyleDeclaration } from "cssstyle"

const style = new CSSStyleDeclaration();
style.border = "inherit";
style.borderWidth = "unset";

Exception

node_modules/.pnpm/cssstyle@6.2.0/node_modules/cssstyle/lib/normalize.js:290
          shorthandObj[key] = parsedValue;
                            ^

TypeError: Cannot create property 'border-width' on string 'inherit'
    at replaceBorderShorthandValue (node_modules/.pnpm/cssstyle@6.2.0/node_modules/cssstyle/lib/normalize.js:290:29)
    at prepareBorderArrayValue (node_modules/.pnpm/cssstyle@6.2.0/node_modules/cssstyle/lib/normalize.js:707:31)
    at prepareBorderProperties (node_modules/.pnpm/cssstyle@6.2.0/node_modules/cssstyle/lib/normalize.js:935:5)
    at CSSStyleDeclaration._borderSetter (node_modules/.pnpm/cssstyle@6.2.0/node_modules/cssstyle/lib/CSSStyleDeclaration.js:449:30)
    at CSSStyleDeclaration.set (node_modules/.pnpm/cssstyle@6.2.0/node_modules/cssstyle/lib/properties/borderWidth.js:29:14)

Node.js v22.18.0

Seems related to #247. Thanks very much!