expression register as calculator with floats?

I often use the expression register to make simple calculations in
vim. Eg. in insert mode I type "Ctrl-r = 59 + 38" to get the result
97 in my text, but this works fine for integers only. Is there a way
to use this feature with digital numbers as well? Like "Ctrl-r = 59.4
+ 37.5" to get the result 96.9 in the text.

Kind regards
Pauli

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