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The buffer that join, JSON.stringify, the URI functions, escape and unescape write into takes one unit of fuel for every 16 code units written, so writing a long run of separators or copying a long string over and over ends with the fuel limit. Its bytes are added back to the heap total after each collection until the string is finished, and a native call that ends early gives them back, so a collection while a string is being built no longer lets the heap estimate drop below what is in use.