Make MinLength int again

It's actually preferable, it seems:
https://stackoverflow.com/a/1148505

src/Sqids/SqidsEncoder.cs

@@ -22,6 +22,7 @@ public sealed class SqidsEncoder
 #endif
 {
 	private const int MinAlphabetLength = 3;
+	private const int MaxMinLength = 255;
 	private const int MaxStackallocSize = 256; // NOTE: In bytes — this value is essentially arbitrary, the Microsoft docs is using 1024 but recommends being more conservative when choosing the value (https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/operators/stackalloc), Hashids apparently uses 512 (https://github.com/ullmark/hashids.net/blob/9b1c69de4eedddf9d352c96117d8122af202e90f/src/Hashids.net/Hashids.cs#L17), and this article (https://vcsjones.dev/stackalloc/) uses 256. I've tried to be pretty cautious and gone with a low value.
 
 	private readonly char[] _alphabet;
@@ -80,6 +81,12 @@ public SqidsEncoder(SqidsOptions options)
 				$"The alphabet must contain at least {MinAlphabetLength} characters."
 			);
 
+		if (options.MinLength < 0 || options.MinLength > MaxMinLength)
+			throw new ArgumentOutOfRangeException(
+				nameof(options.MinLength),
+				$"The minimum length must be between 0 and {MaxMinLength}."
+			);
+
 		_minLength = options.MinLength;
 
 		// NOTE: Cleanup the blocklist:

src/Sqids/SqidsOptions.cs

@@ -25,9 +25,9 @@ public sealed class SqidsOptions
 	/// <summary>
 	/// The minimum length for the IDs.
 	/// The default is 0; meaning the IDs will be as short as possible.
-	/// 255 is the maximum; hence `byte` as the type.
+	/// 255 is the maximum.
 	/// </summary>
-	public byte MinLength { get; set; } = 0;
+	public int MinLength { get; set; } = 0;
 
 	/// <summary>
 	/// List of blocked words that must not appear in the IDs.