Check if a value is a SignalSet.
Create a new SignalSet with optional initial values.
Log every mutation call on a SignalSet at Debug level, tagged under
the stax.signal subsystem, with the call site captured at the
caller's frame.
The write-side counterpart to Readable.debug, for SignalSet. Wraps
add, delete, toggle, clear, replace, and update so each
call emits { id, args, callSite }. Zero cost at the default log
level — the check runs once at construction and returns the
underlying signal unwrapped if Debug isn't enabled.
SignalSet namespace.