Parsing case-sensitive and case-insensitive selectors are different

[Semigradsky]

https://www.w3.org/TR/selectors-4/#attribute-case

[foo="bar" i]

AST:

{
	"type": "attribute",
	"content": "[foo=\"bar\" i]",
	"name": "foo",
	"operator": "=",
	"value": "\"bar\"",
	"i": "i",
	"pos": [
		0,
		11
	]
}

---

[foo="bar" I]

AST:

{
	"type": "attribute",
	"content": "[foo=\"bar\" I]",
	"name": "foo",
	"operator": "=",
	"value": "\"bar\" I",
	"pos": [
		0,
		11
	]
}

---

[foo="bar" s]

AST:

{
	"type": "attribute",
	"content": "[foo=\"bar\" s]",
	"name": "foo",
	"operator": "=",
	"value": "\"bar\" s",
	"pos": [
		0,
		11
	]
}

[LeaVerou]

Ah, I didn't read the spec carefully enough and didn't know about s or I. Thanks for spotting that! Should be very easy to fix.

[LeaVerou]

Just pushed a fix! I also renamed the key to caseSensitive instead of the cryptic i.