Added a note about the size_t use for arrays lengths.
Added a note about the size_t use for arrays lengths.

tectronics/numexpr,ooguntola/numexpr,tectronics/numexpr,Alwnikrotikz/numexpr,Alwnikrotikz/numexpr,ooguntola/numexpr,Alwnikrotikz/numexpr,ooguntola/numexpr,tectronics/numexpr