Missing ParseResult.isParseError

[jessekelly881]

What is the problem this feature would solve?

I was looking for an isParseError and couldn't find one. We should probably add ParseResult.isParseError and ParseResult.isParseResult

What is the feature you are proposing to solve the problem?

export const isParseError = (u: unknown): u is ParseResult.ParseError =>
	Predicate.isTagged(u, "ParseError");

What alternatives have you considered?

No response