Floating Pain
Topper mentioned a tweet he saw to me in which someone asked why (4.6 * 100).to_i #=> 459. Though this seems like a ruby bug, it’s really just one of the annoying things you hit with rounding errors and floats. At issue is that #to_i floors the float, instead of rounding it. Since the value may be approximated at 459.999999, the #to_i floors it to 459. To have things work like you’d expect, use #round when converting Float to Fixnum. See below for some code examples:
4.6.to_i # => 4 4.6.round # => 5 (4.6 * 100).to_i # => 459 (4.6 * 100).round # => 460
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Since you enjoy floating pain here is an interesting "post":http://www.danwebb.net/2008/1/2/how-good-is-this on a similar fun.