Javascript prepocessing - simple addition turns result in string

[Noobz]

I simply need to add 0.7 to a returned value in preprocessing, however it seems that javascript is taking 0.7 as a string and converting the whole result to a string.

If I do:
return value+0.7
or any formatting variation of that I've tried, using a test value of 26, it will result in 260.7

Upon testing this further, it seems that using almost exactly the same formula as the documentation shows, any simple addition is converted to a string.

i.e. return (value - 32) will return the correct figure such as 0 for a test value of 32

However, addition is broken.

return (value + 32) will result in 3232

[Noobz]

This is javascript.

https://www.w3resource.com/javascript/operators/string-operator.php

https://stackoverflow.com/questions/...rings-together

return (+value + 32);
return (parseInt(value) + 32);

That works, thank you. I had tried to use Number() and something else I can't recall however simply using +value works