I wouldn't go as far as to say floats are *encouraged in general*, you gave
an example of a questionable sample code, but also have counterexamples,
for example in the type of price attributes in the AR migrations guide.
Bottom line, all Rails core is aware of these gotchas, anything that could
be misleading in this sense is probably an overlook.
Problem is this helper rarely gets a literal, and
number_to_currency(1234567890.50)
reads much better than
number_to_currency("1234567890.50".to_d)
for my taste.
It's easy to make something faster if you can make it wrong, and also to
make it read better by stretching the truth just a little bit 😃.
Maybe we could add a sentence saying "The following examples use floats,
however, numbers representing money normally need and exact type like
BigDecimal". Also open to better suggestions.
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