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This change adds the same inheritance safety measures already implemented in native-shim.ts

  • Ensures that instances of the patched HTMLElement have a .constructor reference pointing to the patched constructor itself.

  • Preserves the prototype chain by setting the patched constructor’s [[Prototype]] to the native HTMLElement.

Context
This issue was discovered in a very specific case involving legacy applications still using custom-elements-es5-adapter.js, the old @open-wc/scoped-elements for Lit 1, and the new @open-wc/scoped-elements for Lit 3.

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