Danger Will Robinson! Missing API!

[Charles Oliver Nutter]

Oh my goodness...I just realized an obvious missing API...is there still time?!

SwitchPoint has no way to query if it has been invalidated!

Is this by design? I would like to use this as both a call site guard
and as a queryable trigger...to know whether I can go forward with the
faster SwitchPoint-based logic or not.

So, am I missing something, or is the API missing something?

SwitchPoint.isValid()boolean: Returns true if this SwitchPoint is
still valid (i.e. has not yet been invalidated).

- Charlie