log(sqrt(x)) = 0.5*log(x)

[ekmett]

In

template <typename T, precision P> tquat<T, P> log(tquat<T, P> const& q)

at the end you compute log(QuatLen), which is log(sqrt(...)), but you can shave off the sqrt since you're already computing a logarithm, by exploiting

log(sqrt(x)) = log(pow(x,0.5)) = 0.5*log(x)

No other use of QuatLen is made in the combinator.

[Groovounet]

Thanks for contributing!
Christophe