Loops

Prefer for`forto` to while`while`. [FIXME: needs RFC]

A for`forloop is preferable to a` loop is preferable to a while`whileloop, unless the loop counts in a non-uniform way (making it difficult to express using` loop, unless the loop counts in a non-uniform way (making it difficult to express using for`for`).

Guidelines for loop`loop`. [FIXME]

[FIXME] When is loop`looprecommended? Some possibilities: * For optimistic retry algorithms * For servers * To avoid mutating local variables sometimes needed to fit` recommended? Some possibilities: * For optimistic retry algorithms * For servers * To avoid mutating local variables sometimes needed to fit while`while`