src/v8/test/mjsunit/regress/regress-crbug-229923.js

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// Flags: --expose-externalize-string

var slice = "slow path of JSON.stringify for sliced string".substring(1);
assertEquals('"' + slice + '"', JSON.stringify(slice, null, 0));

var parent = "external string turned into two byte";
var slice_of_external = parent.substring(1);
try {
  // Turn the string to a two-byte external string, so that the sliced
  // string looks like one-byte, but its parent is actually two-byte.
  externalizeString(parent, true);
} catch (e) { }
assertEquals('"' + slice_of_external + '"',
             JSON.stringify(slice_of_external, null, 0));