Provides a basic test for a given variable to test if it has the shape of a writable store by having a subscribe set, and update functions.
subscribe
set
update
Note: functions are also objects, so test that the variable might be a function w/ subscribe, set, and update` functions.
set, and
variable to test that might be a store.
Whether the variable tested has the shape of a store.
Provides a basic test for a given variable to test if it has the shape of a writable store by having a
subscribeset, andupdatefunctions.Note: functions are also objects, so test that the variable might be a function w/
subscribe,set, andupdate` functions.