Don't set read-only class if readonly is null #276
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toggleClass() requires a boolean value, not just a truthy/falsy one. When readonly is null, the current code results in the read-only class being toggled (since null is treated the same as the argument not being provided), resutling in indeterminate results depending on what the previous value of readonly was. To avoid this surprising behavior, just coerce the value of readonly to a boolean before passing it to toggleClass(), so that null will always result in no read-only class, same as if the readonly attribute was not provided.
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toggleClass() requires a boolean value, not just a truthy/falsy one.
Because the current code just passes in the value of readonly directly, if it is null, the current code results in the read-only class toggled rather than set to any determinate value. While setting readonly to null may be an edge case, it's easy to make this behavior less surprising and unintuitive by simply coercing the value passed to toggleClass to a boolean, so that readonly=null always results in no read-only class.
I've created an Ember Twiddle demonstrating the current behavior here (it may take some time to build, I'm not sure where that build is cached): https://ember-twiddle.com/b9967c2e3604add699c58a2f97399915?openFiles=templates.application%5C.hbs%2C
You can see in the demonstration that true and false act as expected, but
nullbehaves strangely - if you selecttrueand thennull, the checkbox will be toggleable, but if you selectfalseand thennull, it will be read-only. This is because setting readonly tonullhas the effect of toggling it, instead of setting it to any given value.