I had a look through the code in `prefixedoutstream.hpp` and
`prefixedoutstream_impl.hpp`.
Converting each output to a string causes the floating-point types to lose the
type information needed by the `destination` stream to output the necessary
precision.
I could imagine two solutions to the problem
1. Introduce 3 inline template specialisations for
`util::prefixedoutstream::BaseLogic` for `float`, `double` and `long double`,
each of which directly writes the `val` to the `destination` stream.
2. Use SFINAE on `BaseLogic` to write `val` directly to the `destination` if
the type satisfies `std::is_floating_point`.
Any thoughts?
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