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By the way, I forgot to mention in my previous message that yesterday night I have finished coding a Fast Walsh-Hadamard Transform. It might also be nice to include into the standard library.
Another ...

can be done with:

// returns 2^b such that 2^b <= x < 2^b+1, where b is an integer
// Relies on twos-complement arithmetic.
int nextlowerpowerof2(int x) { return x & -x; }

if (data. ...

Ok. Here goes a new function.

uint bitReverse( uint x ){
asm {
mov EDX, EAX;
shr EAX, 1;
and EDX, 0x5555_5555;
and EAX, 0x5555_5555;
shl EDX, 1;
or EAX ...

Ok. Here goes a new function.

uint bitReverse( uint x ){
asm {
mov EDX, EAX;
shr EAX, 1;
and EDX, 0x5555_5555;
and EAX, 0x5555_5555;
shl EDX, 1;
or EAX ...

For me, option 1 seems the most reasonable way to go!
A simple "import std.math;" would import the already standard (as in C) math functions, and "import std.math.statistic", etc... for more special ...