booleans should default to false

[domenic]

It looks like there are already lots of threads covering potential changes to the name and semantics that might impact this. But, wherever they land, they should not end up with a boolean that defaults to true. Web IDL even explicitly warns against this:

Warning

It is strongly suggested not to use default value of true for boolean-typed arguments, as this can be confusing for authors who might otherwise expect the default conversion of undefined to be used (i.e., false).

[RByers]

Ah, I wasn't aware of that guidance - thanks. I was trying to avoid double negative, but it's easy to just do that. I.e. doesntCancel instead of 'mayCancel.