Function: padicprec
Section: conversions
C-Name: padicprec
Prototype: lGG
Help: padicprec(x,p): absolute p-adic precision of object x.
Doc: absolute $p$-adic precision of the object $x$. This is the minimum
 precision of the components of $x$. The result is \tet{LONG_MAX}
 ($2^{31}-1$ for 32-bit machines or $2^{63}-1$ for 64-bit machines) if $x$ is
 an exact object.
