unites several different rounding methods and lets you choose to which order of magnitude you want to round
* 'round', 'ceil', 'floor' rounds to multiples of 10^x, e.g. round to multiples of 0.1
* 'clog', 'flog' rounds to (ceil/floor) to next logarithmic value
* 'fix', 'infix' rounds towards/away from zero or other value
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