Creates a new counter with an initial value that can be used as part of a document's content.
Represents whether or not the value should be set as a
default value. Set this to true if you want to set a default value that
you expect to be overwritten by other devices in the network. The default
value is false.
Increments the counter by amount, which can be any valid number.
Represents a counter that can be part of a DocumentValue and incremented during document updates.