add checks @ `ZodBigInt`.

[igalklebanov]

Hey 👋

This PR adds .gt, .gte, .lt, .lte, .positive, .negative, .nonpositive, .nonnegative, .gigantic (.unsafe), .safe & .multipleOf to ZodBigInt.

closes #1592.

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[colinhacks]

Thanks Igal! I like a lot of this but I made some changes.

I consolidated ZodBigIntTooSmallIssue into ZodTooSmallIssue by converting minimum: number to minimum: number | bigint. I appreciate the effort to avoid breaking changes on the existing issue types, but I'd rather keep too_big/too_small/etc consolidated into a single issue type.

I got rid of all the .safe()/.unsafe() stuff, since it doesn't apply to bigints - the point of using a bigint is to not worry about being inside the safe integer range. I'd accept a PR to add .safe() to ZodNumber where it'd have more utility. But .gigantic/.unsafe seem unnecessary to me.

[igalklebanov]

Thanks Colin! ⚡

I got rid of all the .safe()/.unsafe() stuff, since it doesn't apply to bigints - the point of using a bigint is to not worry about being inside the safe integer range. I'd accept a PR to add .safe() to ZodNumber where it'd have more utility. But .gigantic/.unsafe seem unnecessary to me.

The use case I was thinking about was a 3rd party library, e.g. a database driver, returning bigint values, but zod consumer knows the underlying value should be in the safe integer range (select count(*) as friends from people left join friendships group by people.id - friends column might return as bigint, but although there's lots of people, most people don't have that many friends). So a helper such as ZodBigInt.safe() allows to describe this explictly and chain with .transform(Number) knowing the parsed underlying value is unchanged.

I'll add a separate PR for ZodNumber.safe() as js behavior with anything beyond Number.MAX_SAFE_INTEGER behaves weirdly.

Done #1753.

[colinhacks]

The use case I was thinking about was a 3rd party library, e.g. a database driver, returning bigint values, but zod consumer knows the underlying value should be in the safe integer range (select count(*) as friends from people left join friendships group by people.id - friends column might return as bigint, but although there's lots of people, most people don't have that many friends). So a helper such as ZodBigInt.safe() allows to describe this explictly and chain with .transform(Number) knowing the parsed underlying value is unchanged.

This makes a lot of sense, sorry.