It's not trying to do string editing at all.
It's operating on JSON de-serialized to maps and lists. String editing isn't a valid operation on the data model they specify. You can replace a string value with another.
Section 3.3 outlines the allowed operations, which basically allows you to obtain an iterator, move it, insert, delete and retrieve keys and values.
You could certainly model string editing in it, by putting each character into it as a separate value, but then as you point out it'd probably not do very well because it doesn't contain heuristics to model intent of text editing, but to model changes to a JSON object hierarchy while avoiding loss of data.
You could use this algorithm combined with one intended for string-editing to improve on it for values where partial edits of the values matters, certainly.
It's operating on JSON de-serialized to maps and lists. String editing isn't a valid operation on the data model they specify. You can replace a string value with another.
Section 3.3 outlines the allowed operations, which basically allows you to obtain an iterator, move it, insert, delete and retrieve keys and values.
You could certainly model string editing in it, by putting each character into it as a separate value, but then as you point out it'd probably not do very well because it doesn't contain heuristics to model intent of text editing, but to model changes to a JSON object hierarchy while avoiding loss of data.
You could use this algorithm combined with one intended for string-editing to improve on it for values where partial edits of the values matters, certainly.