Error thrown by string().default('foo').required().validate(undefined, {strict: true}) is not ValidationError

[PierreJeanjacquot]

Describe the bug
validate with {strict; true}) option on string schema with default() value and required() throws before validation with value undefined

To Reproduce

https://codesandbox.io/s/yupissue-string-with-default-validate-strict-rdg7j

Expected behavior

await yup.string().default('foo').required("is required").validate(undefined, {strict: true});
// should throw "ValidationError: is required"

Platform (please complete the following information):

• Browser: Firefox for Ubuntu
• Version 76.0.1 (64-bits)