Fix issue of more inferences leading to worse results

Author: ahejlsberg

src/services/services.ts

@@ -1798,7 +1798,7 @@ namespace ts {
             const span = createTextSpanFromBounds(start, end);
             const formatContext = formatting.getFormatContext(formatOptions);
 
-            return flatMap(deduplicate(errorCodes, equateValues, compareValues), errorCode => {
+            return flatMap(deduplicate<number>(errorCodes, equateValues, compareValues), errorCode => {
                 cancellationToken.throwIfCancellationRequested();
                 return codefix.getFixes({ errorCode, sourceFile, span, program, host, cancellationToken, formatContext, preferences });
             });