gptel-transient: Ensure user enters a number when prompted #637
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gptel-transient.el (gptel--transient-read-variable, gptel--transient-read-number): New function that uses standard `read-number' to read a numeric value, returning nil for default. Drop the read-variable function since we were only using it for prompting numbers.
gptel-transdient.el (gtpel--infix-num-messages-to-send, gptel--infix-max-tokens, gptel--infix-temperature): Use the new function as :reader.
This also fixes handling of history, which is broken with at least transient 0.8.4.