I'm trying to get my Javascript code 100% JSLint clean.

I've got some JS code that I've lifted from elsewhere to create a UUID. That code has the following line:

s[16] = hexDigits.substr((s[16] & 0x3) | 0x8, 1);

This line incites JSLint to generate two error messages:

1) Unexpected use of '&'
2) Unexpected use of '|'

I don't understand why -- I'd appreciate counsel regarding how to recode to eliminate the error message.

javascript jslint
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