Add float scalars and test

src/CSnakes.Runtime/Python/IPyBuffer.cs

@@ -9,4 +9,5 @@ public interface IPyBuffer
     Span<Int64> AsInt64Scalar();
     Span<UInt32> AsUInt32Scalar();
     Span<UInt64> AsUInt64Scalar();
+    public Span<float> AsFloatScalar();
 }

src/CSnakes.Runtime/Python/PyBuffer.cs

@@ -62,4 +62,10 @@ public unsafe Span<UInt64> AsUInt64Scalar()
         EnsureFormat('Q');
         return new Span<UInt64>((void*)_buffer.buf, (int)(Length / 8));
     }
+
+    public unsafe Span<float> AsFloatScalar() {
+        EnsureScalar();
+        EnsureFormat('f');
+        return new Span<float>((void*)_buffer.buf, (int)(Length / 4));
+    }
 }

src/Integration.Tests/BufferTests.cs

@@ -21,4 +21,22 @@ public void TestSimpleBuffer()
         Assert.Equal((int)5, result[4]);
 
     }
+
+    [Fact]
+    public void TestBufferLargeFloatScalar()
+    {
+        // SKip if < Python 3.12
+        if (new Version(Env.Version.Split(' ')[0]) < new Version(3, 11, 0))
+        {
+            return;
+        }
+        var testModule = Env.TestBuffer();
+        var bufferObject = testModule.TestFloatScalar();
+        Assert.Equal(1532 * sizeof(float), bufferObject.Length); 
+        Assert.True(bufferObject.Scalar);
+
+        // Check the buffer contents
+        Span<float> result = bufferObject.AsFloatScalar();
+        Assert.Equal(1532, result.Length);
+    }
 }

src/Integration.Tests/python/test_buffer.py

@@ -8,3 +8,8 @@
 
 def test_simple_buffer() -> Buffer:
     return np.array([1, 2, 3, 4, 5], dtype=np.int32)
+
+
+def test_float_scalar() -> Buffer:
+    # create an array with 1532 floats between 0 and 1, similar to an embedding vector
+    return np.random.rand(1532).astype(np.float32)