Fix invalid ArrayBuffer -> Number cast

[chrisparton1991]

Fixes #77.

I ran npm test before my changes and got 7 failing tests. I'm not sure if it's because I'm running on Windows?

I also ran Flow after my change and got a warning, but I've never used Flow and don't know how to fix that one.

[aadsm]

Can you paste the failures you got?

[chrisparton1991]

Sure thing, here are the errors: flow-failures.txt test-failures.txt

I'm running Windows 10.0.15063, Node 8.4.0 and NPM 5.4.2.

[aadsm]

@chrisparton1991, I’ve fixed both tests and flow and pushed them to master so it should be fine now, thanks for warning (I should really setup travis). There’s only one thing missing now, can you add a test that catches the bug you fix to avoid having regressions in the future?

[chrisparton1991]

Thanks for getting that stuff fixed up! I can run all of the tests without issue now.

The unit tests already appear to be catching the issue. With my fix they all pass, without the fix I get:

 FAIL  src\__tests__\BlobFileReader-test.js
  ● BlobFileReader › should read a byte

    Offset 0 hasn't been loaded yet.

[MartinDawson]

@aadsm Can this be merged please? Thanks for fixing @chrisparton1991.

[chrisparton1991]

No problem @MartinDawson, glad I could help :)

All glory to the Hypnotoad!

[MartinDawson]

hehe, very helpful indeed as it was causi... ALL GLORY TO THE HYPNOTOAD!

[aadsm]

Awesome, thank you so much for fixing this!

[chrisparton1991]

No problem, thanks for making an awesome library :)

I'm using jsmediatags in my LED sequencer project (https://github.com/chrisparton1991/sparkled), it's been super useful.

[aadsm]

good to hear! that project looks pretty cool :)