relativeSpecifier = (absoluteModuleSpecifier, compartmentLocation) => {
  assert(
    isLocationWithinCompartment(absoluteModuleSpecifier, compartmentLocation),
    `Module specifier location "${absoluteModuleSpecifier}" does not start with compartment location "${compartmentLocation}"`,
  );
  return `./${absoluteModuleSpecifier.substring(compartmentLocation.length)}`;
}
Computes the relative path to a module from its compartment location (including a leading `./`)

@param {string} absoluteModuleSpecifier Absolute path (not URL) to a module specifier
@param {string} compartmentLocation Absolute path to compartment location
@returns {string} Redirect static module interface; the `specifier` prop of this value _must_ be a relative path with leading `./`