add failing tests

test/runtime/samples/attribute-boolean-case-insensitive/_config.js

@@ -0,0 +1,3 @@
+export default {
+	html: `<input readonly>`
+};

test/runtime/samples/attribute-boolean-case-insensitive/main.svelte

@@ -0,0 +1 @@
+<input READONLY={true} REQUIRED={false}>

test/runtime/samples/attribute-boolean-with-spread/_config.js

@@ -0,0 +1,3 @@
+export default {
+	html: `<input>`
+};

test/runtime/samples/attribute-boolean-with-spread/main.svelte

@@ -0,0 +1 @@
+<input {...{ foo: null }} readonly={false} required={false} disabled={null}>