How to identify type of global state delta in app call txn

Look at “Application Global State Delta” in the below transaction:

This is what we get in txn json object for global state delta:

export interface A_GlobalStateDelta {
    key: string
    value: {
        bytes: string
        action: number
        uint: number

This doesn’t have “type” in the value object.
Also, what is the significance of “action” in the value?

The types are described here for action

and here for teal type