I want to convert an arbitrary number with an arbitrary number of decimal places to a string and back, and get the exactly the same number, for example:

1234.5678 to string "1234.5678" to number again 1234.5678
456 to string "456" to number again 456 (not 456.00)
987654325.123456 to string "987654325.123456" to number again 987654325.123456

I don't know in advance the number of digits or number of decimal digits.

I don´t mind if the string is in any other format, like binary bytes or anything like that, I just want to get exactly the same number back. This is for storing a numeric value in the registry as a binary string, and then get back the number stored.

Any ideas?