At risk of derailing the conversation with a tangent... I don't understand the premise. Why is it so important that URLs are mutable? (Other than already being drafted that way.)
We're seeing major performance and reliably improvements by going for more immutable types in both our server and client apps. The React library relies heavily on the properties of immutability. In fact, we even want to prevent our developers from using existing mutable APIs that are known to be error prone. Primarily Date which is a terrible mutable API. We would like to see more DOM and ES APIs embrace immutability. In the future we would also like to propose more convenience APIs, performance improvements and possibly syntax for making immutable data (such as persistent data structures) easier to work with.
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