`SC9001` ICE: `recordKeyGet receiver: expected record, got dyn` on `===` comparison of `Record<string, X>` property access

[xXCrash2BomberXx]

Comparing a direct property read off a Record<string, X>-typed object with ===/!== crashes the compiler with an internal error, for any value type X (tested with both string and object/record-shaped values). The crash disappears if the property read is first assigned to a local variable and the variable is compared instead — same runtime semantics, different compile result.

Minimal Demo

/** @type {Record<string, string>} */
const R = { a: "x", b: "y" };
console.log(R.a === R.a);

Output

[...]/test.js:3:13 - error SC9001: internal compiler error: in %init.0: recordKeyGet receiver: expected record, got dyn — please report this

  2 | const R = { a: "x", b: "y" };
  3 | console.log(R.a === R.a);   // internal compiler error: recordKeyGet receiver: expected record, got dyn
    |             ^
  4 | 

[...]/test.js:3:21 - error SC9001: internal compiler error: in %init.0: recordKeyGet receiver: expected record, got dyn — please report this

  2 | const R = { a: "x", b: "y" };
  3 | console.log(R.a === R.a);   // internal compiler error: recordKeyGet receiver: expected record, got dyn
    |                     ^
  4 | 

2 errors.

Minimal Workaround

/** @type {Record<string, string>} */
const R = { a: "x", b: "y" };
const a = R.a;
console.log(a === a);   // compiles fine

[ctate]

Thanks for flagging - fixed in #184