ember-inflector: Irregular rule for unitOfMeasure to unitsOfMeasure does not work

I tried adding

inflector.irregular('unitOfMeasure', 'unitsOfMeasure');

To my app and it doesn’t work, it hits /api/unitOfMeasure, it should now be hitting /api/unitsOfMeasure

I created a unit test in /tests/unit/inflector-test.js that fails on both asserts in latest master:

test('unit of measure', function(assert) {
  inflector.irregular('unitOfMeasure', 'unitsOfMeasure');

  assert.equal(inflector.singularize('unitsOfMeasure'), 'unitOfMeasure', 'irregular singularization rule was applied');
  assert.equal(inflector.pluralize('unitOfMeasure'), 'unitsOfMeasure', 'irregular pluralization rule was applied');
});

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I had a quick debug, it seems to find the irregular rule ok and populate substitution in the for loop, but then I think the return in that loop of return word.replace(rule, substitution); doesn’t do the job as word is unitOfMeasure and rule is unitofmeasure, so there is no match due to the casing?