Deprecate sumBy and sumByDouble with WARNING

libraries/tools/kotlin-stdlib-gen/src/templates/Aggregates.kt

@@ -221,6 +221,8 @@ object Aggregates : TemplateGroupBase() {
         includeDefault()
         include(CharSequences, ArraysOfUnsigned)
     } builder {
+        deprecate(Deprecation("Use sumOf instead.", "this.sumOf(selector)", DeprecationLevel.WARNING, warningSince = "1.5"))
+
         inline()
         doc { "Returns the sum of all values produced by [selector] function applied to each ${f.element} in the ${f.collection}." }
         returns("Int")
@@ -291,6 +293,8 @@ object Aggregates : TemplateGroupBase() {
         includeDefault()
         include(CharSequences, ArraysOfUnsigned)
     } builder {
+        deprecate(Deprecation("Use sumOf instead.", "this.sumOf(selector)", DeprecationLevel.WARNING, warningSince = "1.5"))
+
         inline()
         specialFor(ArraysOfUnsigned) { inlineOnly() }
 

libraries/tools/kotlin-stdlib-gen/src/templates/Numeric.kt

@@ -39,7 +39,7 @@ object Numeric : TemplateGroupBase() {
                 if (p == p.sumType())
                     "return storage.sum().to${p.sumType().name}()"
                 else
-                    "return sumBy { it.to${p.sumType().name}() }"
+                    "return sumOf { it.to${p.sumType().name}() }"
             }
         }
         specialFor(Iterables, Sequences, ArraysOfObjects, ArraysOfPrimitives) {