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Minor Changes

• 73de78d #3788 Thanks @probablyup! - Added typescript generics to ArrayHelpers interface and its methods so that users who use TypeScript can set the type for their arrays and have type safety on array utils. I have also gone ahead and made supplying a type for the generic optional for the sake of backwards compatibility so any existing TS code that does not give a type for the FieldArray will continue to work as they always have.

• 39a7bf7 #3786 Thanks @probablyup! - Yup by default only allows for cross-field validation within the
  same field object. This is not that useful in most scenarios because
  a sufficiently-complex form will have several yup.object() in the
  schema.

  const deepNestedSchema = Yup.object({
    object: Yup.object({
      nestedField: Yup.number().required(),
    }),
    object2: Yup.object({
      // this doesn't work because `object.nestedField` is outside of `object2`
      nestedFieldWithRef: Yup.number()
        .min(0)
        .max(Yup.ref('object.nestedField')),
    }),
  });

  However, Yup offers something called context which can operate across
  the entire schema when using a \$ prefix:

  const deepNestedSchema = Yup.object({
    object: Yup.object({
      nestedField: Yup.number().required(),
    }),
    object2: Yup.object({
      // this works because of the "context" feature, enabled by $ prefix
      nestedFieldWithRef: Yup.number()
        .min(0)
        .max(Yup.ref('$object.nestedField')),
    }),
  });

  With this change, you may now validate against any field in the entire schema,
  regardless of position when using the \$ prefix.