Use the right attribute - maxlength instead of maxLength

[shubham88fru]

Fixes #1459

Issue: maxLength attribute is being read instead of the correct maxlength attribute.

[NullVoxPopuli]

is there a way to test that maxLength is wrong or unsupported somehow?

[shubham88fru]

is there a way to test that maxLength is wrong or unsupported somehow?

@NullVoxPopuli per MDN, the actual attribute is maxlength and not maxLength.
Now the reason that it still worked with maxLength was because el.getAttribute(arg) internally lowercases whatever arg was passed (check this point in MDN) effectively converting maxLength to maxlength. So to your point, maxLength is technically wrong but didn't break anything yet because of the lowercasing done by el.getAttribute().

However, for the sake of consistency and correctness, I suggest that we change the attribute to the right value, which is maxlength.

Note that in the same file, the same attribute is also read at a different place correctly -

ember-test-helpers/addon/addon-test-support/@ember/test-helpers/dom/-guard-for-maxlength.ts

Line 41 in 3b83f12

const maxlength = element.getAttribute('maxlength');

Does that answer your question? Sorry if I misunderstood what you were asking.