docs: update comment

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/assign/lib/main.js

@@ -281,7 +281,7 @@ function assign( arrays ) {
 		x = complex2real( x );
 		y = complex2real( y );
 	}
-	// Determine whether we are casting a real data type to a complex data type and we need to use a specialized accessor (note: we don't support the other way, complex-to-real, as this is not an allowed (mostly) safe cast)...
+	// Determine whether we are casting a real data type to a complex data type and we need to use a specialized accessor (note: we don't support the other way, complex-to-real, as this is not an allowed (mostly) safe cast; note: we cannot create a specialized view for assigning only real components, as the imaginary component for each element in `y` also needs to be set to zero and while we could perform two passes, it's not clear it's worth the effort)...
 	else if ( isRealDataType( x.dtype ) && isComplexDataType( y.dtype ) ) {
 		x.accessorProtocol = true;
 		x.accessors[ 0 ] = castReturn( x.accessors[ 0 ], 2, complexCtors( y.dtype ) ); // eslint-disable-line max-len