Method code for $float.round_to()

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arg float, places;
var place_value;

if (places < 1 || places > 6)
    throw(~range, "Second argument must between 1 and 6.");
place_value = powers_of_ten[places];
return round(float * place_value) / place_value;

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// Created 02-Nov-1998 as a part of ColdCore, see: @help Credit