removed Iterator.toString() as it changes the iterator state, the default is fine and folks should be explicit about iterating over an iterator. Also disabled the default limit on the iterator on join(); if folks want to limit the join they should be explicit

libraries/stdlib/src/generated/ArraysFromJavaCollections.kt

@@ -1,8 +1,15 @@
-// NOTE this file is auto-generated from stdlib/src/kotlin/JavaCollections.kt
+// NOTE this file is auto-generated from src/kotlin/JavaCollections.kt
 package kotlin
 
 import java.util.*
 
+//
+// This file contains methods which are optimised for working on Collection / Array collections where the size
+// could be used to implement a more optimal solution
+//
+// See [[GenerateStandardLib.kt]] for more details
+//
+
 /**
  * Returns a new List containing the results of applying the given function to each element in this collection
  *

libraries/stdlib/src/generated/ArraysFromJavaIterables.kt

@@ -1,4 +1,4 @@
-// NOTE this file is auto-generated from stdlib/src/kotlin/JavaIterables.kt
+// NOTE this file is auto-generated from src/kotlin/JavaIterables.kt
 package kotlin
 
 import kotlin.util.*

libraries/stdlib/src/generated/ArraysFromJavaIterablesLazy.kt

@@ -1,4 +1,4 @@
-// NOTE this file is auto-generated from stdlib/src/kotlin/JavaIterablesLazy.kt
+// NOTE this file is auto-generated from src/kotlin/JavaIterablesLazy.kt
 package kotlin
 
 import kotlin.util.*
@@ -67,7 +67,7 @@ inline fun <T> Array<T>.takeWhile(predicate: (T) -> Boolean): List<T> = takeWhil
  *
  * @includeFunction ../../test/CollectionTest.kt join
  */
-inline fun <T> Array<T>.join(separator: String, prefix: String = "", postfix: String = "") : String {
+inline fun <T> Array<T>.join(separator: String = ", ", prefix: String = "", postfix: String = "") : String {
     val buffer = StringBuilder(prefix)
     var first = true
     for (element in this) {

libraries/stdlib/src/generated/JavaUtilIterablesFromJavaCollections.kt

@@ -1,8 +1,15 @@
-// NOTE this file is auto-generated from stdlib/src/kotlin/JavaCollections.kt
+// NOTE this file is auto-generated from src/kotlin/JavaCollections.kt
 package kotlin
 
 import java.util.*
 
+//
+// This file contains methods which are optimised for working on Collection / Array collections where the size
+// could be used to implement a more optimal solution
+//
+// See [[GenerateStandardLib.kt]] for more details
+//
+
 /**
  * Returns a new List containing the results of applying the given function to each element in this collection
  *

libraries/stdlib/src/generated/JavaUtilIteratorsFromJavaIterables.kt

@@ -1,4 +1,4 @@
-// NOTE this file is auto-generated from stdlib/src/kotlin/JavaIterables.kt
+// NOTE this file is auto-generated from src/kotlin/JavaIterables.kt
 package kotlin
 
 import java.util.*

libraries/stdlib/src/generated/StandardFromJavaCollections.kt

@@ -1,8 +1,15 @@
-// NOTE this file is auto-generated from stdlib/src/kotlin/JavaCollections.kt
+// NOTE this file is auto-generated from src/kotlin/JavaCollections.kt
 package kotlin
 
 import java.util.*
 
+//
+// This file contains methods which are optimised for working on Collection / Array collections where the size
+// could be used to implement a more optimal solution
+//
+// See [[GenerateStandardLib.kt]] for more details
+//
+
 /**
  * Returns a new List containing the results of applying the given function to each element in this collection
  *

libraries/stdlib/src/generated/StandardFromJavaIterables.kt

@@ -1,4 +1,4 @@
-// NOTE this file is auto-generated from stdlib/src/kotlin/JavaIterables.kt
+// NOTE this file is auto-generated from src/kotlin/JavaIterables.kt
 package kotlin
 
 import kotlin.util.*

libraries/stdlib/src/generated/StandardFromJavaIterablesLazy.kt

@@ -1,4 +1,4 @@
-// NOTE this file is auto-generated from stdlib/src/kotlin/JavaIterablesLazy.kt
+// NOTE this file is auto-generated from src/kotlin/JavaIterablesLazy.kt
 package kotlin
 
 import kotlin.util.*
@@ -67,7 +67,7 @@ inline fun <T> Iterable<T>.takeWhile(predicate: (T) -> Boolean): List<T> = takeW
  *
  * @includeFunction ../../test/CollectionTest.kt join
  */
-inline fun <T> Iterable<T>.join(separator: String, prefix: String = "", postfix: String = "") : String {
+inline fun <T> Iterable<T>.join(separator: String = ", ", prefix: String = "", postfix: String = "") : String {
     val buffer = StringBuilder(prefix)
     var first = true
     for (element in this) {

libraries/stdlib/src/kotlin/Iterators.kt

@@ -129,20 +129,13 @@ private class TakeWhileIterator<T>(val iterator: java.util.Iterator<T>, val pred
  *
  * @includeFunction ../../test/iterators/IteratorsTest.kt joinConcatenatesTheFirstNElementsAboveAThreshold
  */
-inline fun <T> java.util.Iterator<T>.join(separator: String, prefix: String = "", postfix: String = "", limit: Int = 20) : String {
+inline fun <T> java.util.Iterator<T>.join(separator: String = ", ", prefix: String = "", postfix: String = "", limit: Int? = null) : String {
     val buffer = StringBuilder(prefix)
     var first = true; var count = 0
     for (element in this) {
         if (first) first = false else buffer.append(separator)
-        if (++count <= limit) buffer.append(element) else break
+        if (limit == null || ++count <= limit) buffer.append(element) else break
     }
-    if (count > limit) buffer.append("...")
+    if (limit != null && count > limit) buffer.append("...")
     return buffer.append(postfix).toString().sure()
 }
-
-/**
- * Returns a comma-separated representation of no more than the first 10 elements
- *
- * @includeFunction ../../test/iterators/IteratorsTest.kt toStringJoinsNoMoreThanTheFirstTenElements
- */
-inline fun <T> java.util.Iterator<T>.toString(): String = join(separator = ", ", limit = 10)

libraries/stdlib/src/kotlin/JavaCollections.kt

@@ -2,6 +2,13 @@ package kotlin
 
 import java.util.*
 
+//
+// This file contains methods which are optimised for working on Collection / Array collections where the size
+// could be used to implement a more optimal solution
+//
+// See [[GenerateStandardLib.kt]] for more details
+//
+
 /**
  * Returns a new List containing the results of applying the given function to each element in this collection
  *

libraries/stdlib/src/kotlin/JavaIterablesLazy.kt

@@ -64,7 +64,7 @@ inline fun <T> java.lang.Iterable<T>.takeWhile(predicate: (T) -> Boolean): List<
  *
  * @includeFunction ../../test/CollectionTest.kt join
  */
-inline fun <T> java.lang.Iterable<T>.join(separator: String, prefix: String = "", postfix: String = "") : String {
+inline fun <T> java.lang.Iterable<T>.join(separator: String = ", ", prefix: String = "", postfix: String = "") : String {
     val buffer = StringBuilder(prefix)
     var first = true
     for (element in this) {

libraries/stdlib/test/iterators/IteratorsTest.kt

@@ -52,8 +52,8 @@ class IteratorsTest {
     }
 
     Test fun toStringJoinsNoMoreThanTheFirstTenElements() {
-        assertEquals("0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ...", fibonacci().toString())
-        assertEquals("13, 21, 34, 55, 89, 144, 233, 377, 610, 987, ...", fibonacci().filter {  it > 10 }.toString())
-        assertEquals("144, 233, 377, 610, 987", fibonacci().filter { it > 100 }.takeWhile { it < 1000 }.toString())
+        assertEquals("0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ...", fibonacci().join(limit = 10))
+        assertEquals("13, 21, 34, 55, 89, 144, 233, 377, 610, 987, ...", fibonacci().filter {  it > 10 }.join(limit = 10))
+        assertEquals("144, 233, 377, 610, 987", fibonacci().filter { it > 100 }.takeWhile { it < 1000 }.join())
     }
 }