personal taste.

more unit tests for the quaternion to 3×3 matrix conversion.

mathematical writing, and add static constructors to create quaternions
from a rotation.

code for all matrices.

that are not explicitly real, even with namespace mistakes.

the matrix code itself.

that x + y != x, and nextafter() which behaves like the C function.

bonus, multiplication or division by a power of two will be optimised as
a shift of the exponent.

add the corresponding unit test.

cross product, normalize, etc.

mode, and do not call "new" when we’re not sure "delete" can be called.

the 16-to-32-bit refactoring.

these functions.

so that their initialisation order ensures they have the proper values. Add
unit tests for these constants.

and simplify the Remez code accordingly.

multiplications by integers, especially powers of two.

code shortcut, fix bugs in the addition and subtraction, another one in
the multiplication code, and add new unit tests for most of these.

to 32 bigits.

and add a test suite check for unary minus.

multiplication.