A small minority, but apparently it includes all the floats you’re likely to use. It seems the insight is that you only need 8 bits of exponent in most cases. (And single-precision floating point only has 8 bits of exponent.)

Most double-precision floats are never used because they have high exponents.

> A small minority, but apparently it includes all the floats you’re likely to use.

Sorry, I meant a small minority need to be boxed - all the floats you're likely to use can remain unboxed.