Proof of keyboard modifer key bug in Win10 bld 10074

Press any key(s) in the text area below. If using windows 10 build 10071, you'll notice when you press the shift key with another key (say, "m"), the shift key will stop working after a second or three. Same thing with CTRL and ALT. I reverted
back previous version, which fixed the bug for now.

What the bug looks like in Windwos 10 preview build #10071, if repeating "m"s with shift:
MMMMMmmmmmmmmmmmmmmmmmmmmmmm (well, with one or two "M"s missing or added).

Remember to hit [STOP KEYS] if you want to copy text field data!

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Suppress default handling of: keydown     keypress     keyup     textinput
Show attribute values for: classic     modifiers     DOM 3     old DOM 3