Change the return type of Decode to int[]

Mainly so that the code examples in the README and also at https://sqids.org/dotnet
work (since they're using `int[]` for the variable that holds the return
value of `Decode`.); and also secondarily because it makes the API
more consistent with `Encode`.

This is not a breaking change.

src/Sqids/Sqids.csproj

@@ -8,7 +8,7 @@
 		<OutputType>Library</OutputType>
 
 		<PackageId>Sqids</PackageId>
-		<Version>1.0.1</Version>
+		<Version>1.0.2</Version>
 		<Description>Official .NET port of Sqids. Generate short YouTube-looking IDs from numbers.</Description>
 		<PackageTags>Sqids;ID-generator;number-obfuscator;YouTube-ID</PackageTags>
 		<PackageIconUrl>https://raw.githubusercontent.com/sqids/sqids-dotnet/main/icon.png</PackageIconUrl>

src/Sqids/SqidsEncoder.cs

@@ -217,7 +217,7 @@ private string Encode(ReadOnlySpan<int> numbers, bool partitioned = false)
 	/// input string is null, empty, contains fewer characters than the configured minimum length,
 	/// or includes characters not found in the alphabet.
 	/// </returns>
-	public IReadOnlyList<int> Decode(ReadOnlySpan<char> id)
+	public int[] Decode(ReadOnlySpan<char> id)
 	{
 		if (id.IsEmpty)
 			return Array.Empty<int>();
@@ -269,7 +269,7 @@ public IReadOnlyList<int> Decode(ReadOnlySpan<char> id)
 				ConsistentShuffle(alphabetTemp);
 		}
 
-		return result; // NOTE: We don't do `.ToArray()` here to avoid creating a new array; we just return the list directly as an `IReadOnlyList`.
+		return result.ToArray(); // TODO: A way to return an array without creating a new array from the list like this?
 	}
 
 	private bool IsBlockedId(ReadOnlySpan<char> id)

src/Sqids/SqidsOptions.cs

@@ -1,9 +1,10 @@
 namespace Sqids;
 
 /// <summary>
-/// Custom alphabet that will be used for the IDs.
-/// Must contain at least 5 characters.
-/// The default is lowercase letters, uppercase letters, and digits.
+/// The configuration options for <see cref="SqidsEncoder" />.
+/// All properties are optional; any property that isn't explicitly specified when passing an
+/// instance of this class to the constructor of <see cref="SqidsEncoder" /> will fall back to its
+/// default value.
 /// </summary>
 public sealed class SqidsOptions
 {