Map WebIDL object to TypeScript object

This type on the TS side is relatively new, which is probably why it wasn't used in the first place, but gives more precise definitions and, so, better type checking.

As a side-effect, fixes #290 (although in a different way).

Author: RReverser

src/helpers.ts

@@ -5,14 +5,13 @@ export const bufferSourceTypes = new Set(["ArrayBuffer", "ArrayBufferView", "Dat
 export const integerTypes = new Set(["byte", "octet", "short", "unsigned short", "long", "unsigned long", "long long", "unsigned long long"]);
 export const stringTypes = new Set(["ByteString", "DOMString", "USVString", "CSSOMString"]);
 const floatTypes = new Set(["float", "unrestricted float", "double", "unrestricted double"]);
-const sameTypes = new Set(["any", "boolean", "Date", "Function", "Promise", "void"]);
+const sameTypes = new Set(["any", "boolean", "object", "Date", "Function", "Promise", "void"]);
 export const baseTypeConversionMap = new Map<string, string>([
     ...[...bufferSourceTypes].map(type => [type, type] as [string, string]),
     ...[...integerTypes].map(type => [type, "number"] as [string, string]),
     ...[...floatTypes].map(type => [type, "number"] as [string, string]),
     ...[...stringTypes].map(type => [type, "string"] as [string, string]),
     ...[...sameTypes].map(type => [type, type] as [string, string]),
-    ["object", "any"],
     ["sequence", "Array"],
     ["record", "Record"],
     ["FrozenArray", "ReadonlyArray"],