17686, "lydia-duncan", "[Library Stabilization] Should we make the use of SysBasic in BigInteger public?", "2021-05-12T18:13:33Z"
SysBasic defines syserr, which we take as an out argument for one of the initializers. Does this mean we should make this a public use? When we support initializers that throw (see #8692), we will probably deprecate this initializer in favor of an initializer that throws.