use Error whenever possible

Author: neverRare

src/misc/misc.ts

@@ -1,7 +1,7 @@
 // ensure this module don't have imports and as runtime agnostic as possible,
 // make separate module when necessary
 
-export type ErrorOption = Readonly<{ cause?: unknown }>;
+export type ErrorOption = Readonly<{ cause?: Error }>;
 
 export function nullableAsArray<T>(
   value?: T,

src/parser/parser_lib.ts

@@ -103,7 +103,7 @@ export class Parser<T> {
 export type Position = Readonly<{ position: number; length: number }>;
 export type PositionedErrorOption = Readonly<{
   position?: Position;
-  cause?: unknown;
+  cause?: Error;
 }>;
 export class PositionedError extends ResultError {
   override name = "PositionedError";