scheme_update: Update the scheme
Description
scheme_update() is used by developers to define how two Scheme objects
with the same key should be merged. This typically happens when adding or
updating a Scheme in a collection.
Usage
scheme_update(e1, e2, ...)
Value
A new Scheme object, resulting from merging e1 and e2.
Arguments
- e1
The original Scheme object.
- e2
The new Scheme object. Usually should have the same key as
e1.
- ...
Additional arguments passed to methods.