A dot seperated path. Use
"." if you have a
property name that includes a dot.
Options that configure how the
key gets read.
An object with the following values:
A compute that returns the
key looked up in the scope's context or parent context. This compute can
also be written to, which will set the observable attribute or compute value at the
location represented by the key.
The scope the key was found within. The key might have
been found in a parent scope.
The initial value at the key's location.