Encoding floats creates large encoded string

[akeenl-sp]

Due to the division in the to_id function when encoding numbers the loop continues until the results is smaller than the smallest possible float value, creating large encoded string
Ex.

irb(main):104> sqids = Sqids.new
=>
#<Sqids:0x0000ffff758d57a0
...
irb(main):105> sqids.encode([3.1])
=> "EBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBf"
irb(main):106>

  def to_id(num, alphabet)
    ...
    result = num
    loop do
      id.unshift(chars[result % chars.length])
      result /= chars.length # <- here results never reaches 0 if its a float
      break unless result.positive?
    end
    ...
  end

I have a PR for mapping all the values passed into encode from floats to integers which is what was done in the original HashIds gem
#8

[4kimov]

Merged. Thank you 👍