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to_s 

        # BigDecimal.to_s

(from ruby core)
---
    to_s(s)

---

Converts the value to a string.

The default format looks like  0.xxxxEnn.

The optional parameter s consists of either an integer; or an optional
'+' or ' ', followed by an optional number, followed by an optional 'E'
or 'F'.

If there is a '+' at the start of s, positive values are returned with a
leading '+'.

A space at the start of s returns positive values with a leading space.

If s contains a number, a space is inserted after each group of that
many fractional digits.

If s ends with an 'E', engineering notation (0.xxxxEnn) is used.

If s ends with an 'F', conventional floating point notation is used.

Examples:

    BigDecimal('-123.45678901234567890').to_s('5F')
      #=> '-123.45678 90123 45678 9'

    BigDecimal('123.45678901234567890').to_s('+8F')
      #=> '+123.45678901 23456789'

    BigDecimal('123.45678901234567890').to_s(' F')
      #=> ' 123.4567890123456789'

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