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[bob1029]

We use decimals for all currency and rate properties. Integer is fine in many cases too.

[quesera → bob1029]

Be careful with floats:

  20.40 == (20.39 + 0.01)
  => false

("decimal" can either be colloqually-equivalent to "float", or it can refer to a distinct data type which is supported by some languages and databases. A proper decimal type is currency-safe to use, if available.)