Remove MultipleResultsException

As this can never happen without checking for separators.

Author: jetersen

src/Hashids.net/Hashids.cs

@@ -178,7 +178,6 @@ public long DecodeSingleLong(string hash)
             return number switch
             {
                 -1 => throw new NoResultException("The hash provided yielded no result."),
-                -2 => throw new MultipleResultsException("The hash provided yielded more than one result."),
                 _ => number,
             };
         }
@@ -206,7 +205,6 @@ public virtual int DecodeSingle(string hash)
             return number switch
             {
                 -1 => throw new NoResultException("The hash provided yielded no result."),
-                -2 => throw new MultipleResultsException("The hash provided yielded more than one result."),
                 _ => (int)number,
             };
         }
@@ -418,11 +416,6 @@ private long GetNumberFrom(string hash)
 
             var hashBuffer = hashBreakdown.Slice(1);
 
-            var indexOfSep = hashBuffer.IndexOfAny(_seps);
-            
-            if (indexOfSep != -1)
-                return -2;
-
             Span<char> alphabet = _alphabet.Length < 512 ? stackalloc char[_alphabet.Length] : new char[_alphabet.Length];
             _alphabet.CopyTo(alphabet);
 

src/Hashids.net/MultipleResultsException.cs

@@ -58,7 +58,7 @@ public void SingleInt_DecodesSingleNumber()
             _hashids.DecodeSingle("yj8").Should().Be(303);
 
             Assert.Throws<NoResultException>(() => _hashids.DecodeSingle(string.Empty));
-            Assert.Throws<MultipleResultsException>(() => _hashids.DecodeSingle("aBMswoO2UB3Sj"));
+            Assert.Throws<NoResultException>(() => _hashids.DecodeSingle("aBMswoO2UB3Sj"));
         }
 
         [Fact]
@@ -120,7 +120,7 @@ public void SingleLong_DecodesSingleNumber()
             _hashids.DecodeSingleLong("jvNx4BjM5KYjv").Should().Be(long.MaxValue);
 
             Assert.Throws<NoResultException>(() => _hashids.DecodeSingleLong(string.Empty));
-            Assert.Throws<MultipleResultsException>(() => _hashids.DecodeSingleLong("6gH3kPY7MJ9zjM3"));
+            Assert.Throws<NoResultException>(() => _hashids.DecodeSingleLong("6gH3kPY7MJ9zjM3"));
         }
 
         [Fact]