change assert

spec.html

@@ -28211,13 +28211,13 @@ <h1>
             1. For each ExportEntry Record _e_ of _module_.[[IndirectExportEntries]], do
               1. If _e_.[[ExportName]] is _exportName_, then
                 1. Assert: _e_.[[ModuleRequest]] is not *null*.
-                1. Assert: _e_.[[ImportName]] is neither ~all-but-default~ nor *null*.
                 1. Let _importedModule_ be GetImportedModule(_module_, _e_.[[ModuleRequest]]).
                 1. If _e_.[[ImportName]] is ~all~, then
                   1. Assert: _module_ does not provide the direct binding for this export.
                   1. Return ResolvedBinding Record { [[Module]]: _importedModule_, [[BindingName]]: ~namespace~ }.
                 1. Else,
                   1. Assert: _module_ imports a specific binding for this export.
+                  1. Assert: _e_.[[ImportName]] is a String.
                   1. Return _importedModule_.ResolveExport(_e_.[[ImportName]], _resolveSet_).
             1. If _exportName_ is *"default"*, then
               1. Assert: A `default` export was not explicitly defined by this module.