|  | @@ -38,7 +38,7 @@ using System.Linq;
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				|  |  |  namespace Google.Protobuf
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				|  |  |  {
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				|  |  |      /// <summary>
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				|  |  | -    /// Provides extensions to messages while parsing
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				|  |  | +    /// Provides extensions to messages while parsing. This API is experimental and subject to change.
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				|  |  |      /// </summary>
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				|  |  |      public sealed class ExtensionRegistry : ICollection<Extension>, IDeepCloneable<ExtensionRegistry>
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				|  |  |      {
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				|  | @@ -67,9 +67,9 @@ namespace Google.Protobuf
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				|  |  |          /// </summary>
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				|  |  |          bool ICollection<Extension>.IsReadOnly => false;
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				|  |  |  
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				|  |  | -        internal bool ContainsInputField(CodedInputStream stream, Type target, out Extension extension)
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				|  |  | -        {
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				|  |  | -            return extensions.TryGetValue(new ObjectIntPair<Type>(target, WireFormat.GetTagFieldNumber(stream.LastTag)), out extension);
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				|  |  | +        internal bool ContainsInputField(CodedInputStream stream, Type target, out Extension extension)
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				|  |  | +        {
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				|  |  | +            return extensions.TryGetValue(new ObjectIntPair<Type>(target, WireFormat.GetTagFieldNumber(stream.LastTag)), out extension);
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				|  |  |          }
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				|  |  |  
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				|  |  |          /// <summary>
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				|  | @@ -82,24 +82,14 @@ namespace Google.Protobuf
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				|  |  |              extensions.Add(new ObjectIntPair<Type>(extension.TargetType, extension.FieldNumber), extension);
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				|  |  |          }
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				|  |  |  
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				|  |  | -        /// <summary>
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				|  |  | -        /// Adds the specified extensions to the registry
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				|  |  | -        /// </summary>
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				|  |  | -        public void Add(params Extension[] newExtensions)
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				|  |  | -        {
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				|  |  | -            ProtoPreconditions.CheckNotNull(newExtensions, nameof(newExtensions));
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				|  |  | -
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				|  |  | -            Add((IEnumerable<Extension>)newExtensions);
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				|  |  | -        }
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				|  |  | -
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				|  |  |          /// <summary>
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				|  |  |          /// Adds the specified extensions to the reigstry
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				|  |  |          /// </summary>
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				|  |  | -        public void Add(IEnumerable<Extension> newExtensions)
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				|  |  | +        public void AddRange(IEnumerable<Extension> extensions)
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				|  |  |          {
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				|  |  | -            ProtoPreconditions.CheckNotNull(newExtensions, nameof(newExtensions));
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				|  |  | +            ProtoPreconditions.CheckNotNull(extensions, nameof(extensions));
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				|  |  |  
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				|  |  | -            foreach (var extension in newExtensions)
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				|  |  | +            foreach (var extension in extensions)
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				|  |  |                  Add(extension);
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				|  |  |          }
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				|  |  |  
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				|  | @@ -134,10 +124,10 @@ namespace Google.Protobuf
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				|  |  |              if (array.Length - arrayIndex < Count)
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				|  |  |                  throw new ArgumentException("The provided array is shorter than the number of elements in the registry");
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				|  |  |  
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				|  |  | -            for (int i = 0; i < array.Length; i++)
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				|  |  | -            {
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				|  |  | -                Extension extension = array[i];
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				|  |  | -                extensions.Add(new ObjectIntPair<Type>(extension.TargetType, extension.FieldNumber), extension);
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				|  |  | +            for (int i = 0; i < array.Length; i++)
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				|  |  | +            {
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				|  |  | +                Extension extension = array[i];
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				|  |  | +                extensions.Add(new ObjectIntPair<Type>(extension.TargetType, extension.FieldNumber), extension);
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				|  |  |              }
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				|  |  |          }
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				|  |  |  
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