Returns a value from an object by the specified label and handlers
default value (can be declared as a function that will be invoked)
Returns a type of data to watch or false
Returns a value to the proxy from the specified raw value
property key for a value
base path to object properties: it is provided to a watch handler with parameters
set of registered handlers
link to the root object of watching
Returns true if the specified value is a watch proxy
Unwraps the specified value to watch and returns the raw object
Returns a value from an object by the specified label and handlers