Minor fixes:

- Fixed function name typo
- Fetcher/Run now returns a combination of errors if any workers error out. All other workers are ordered to shutdown if any one does error out
- findATender now returns a pointer instead of an instance from New

internal/findATender/api.go

@@ -119,6 +119,8 @@ func recursiveRepairDates(v any) bool {
 	return changed
 }
 
+// isDateField reports whether a field holds a date, by its name (see
+// repairDates).
 func isDateField(name string) bool {
 	return strings.HasPrefix(name, "date") ||
 		strings.Contains(name, "Date") ||
@@ -322,10 +324,9 @@ func (ft *FindATender) fetchURI(
 		return nil, err
 	}
 
-	if ft.ctx == nil {
-		copied := *ft
-		copied.ctx = context.Background()
-		ft = &copied
+	ctx := ft.ctx
+	if ctx == nil {
+		ctx = context.Background()
 	}
 
 	if res.StatusCode() == 429 {
@@ -344,7 +345,7 @@ func (ft *FindATender) fetchURI(
 		slog.Warn(fmt.Sprintf(
 			"API rate limit hit, waiting as requested for %d seconds", retrySec,
 		))
-		if rateSleep(ft.ctx, time.Duration(retrySec)*time.Second) != nil {
+		if rateSleep(ctx, time.Duration(retrySec)*time.Second) != nil {
 			return nil, ErrFetchCancelled
 		}