Object on which to perform the operation.
For "val" CRDT object, if omitted, or set to falsy
value, or equal to origin [0, 0], the "set" operation is applied to the
root object, which is LWW Register of a pointer to another CRDT data type.
Mnemonic.
Range of content to delete.
The "del" operation deletes contents from list CRDT (RGA) data types, such as "str", "bin", and "arr". The
whatproperty specifies the ranges of contents to delete.