I thought it was only a "Object" wrapper around a double number..
Nope -- that's Double. double is an IEEE floating point number and
you can't safely represent precise decimal values (read: currency)
with it. There are some numbers you simply can't represent with it at
all, in fact. BigDecimal is specifically designed to handle things
like currency, where you need fixed (but arbitrary) precision as well
as tight control over rounding rules (which you have no control over
with doubles).
ms
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