the module query whether invoked services // are approved. Three states are stored in a per-goroutine value by the // runtime. The indicator starts at indicatorUnset after a reset. Invoking an // approved service transitions to indicatorTrue. Invoking a non-approved // service transitions to indicatorFalse, and it can't leave that state until a // reset. The idea is that functions can "delegate" checks to inner functions, // and if there's anything non-approved in the stack, the final result is //...