Nested refs are no longer unwrapped in types

[posva]

Vue version

^3.5.0

Link to minimal reproduction

https://play.vuejs.org/#eNqNVNtu00AQ/ZXBL6EiWVdNeSAKVVtUCXgoqID6YoHW9iTd1t5d7Y6ToMj/zuw6cd20IBTlMmfOzJmLJ9vkwlqxajCZJXNfOGUJPFJjzzKtamscwRYcLqCFhTM1jJg6enTJMeRjKPZOkRJ6EuSZkunCaE9Q+yW8Dylejz5iVRm4Na4qX42OMj1PO0XWYoOwtpUkZAtgbh2eyRlstyChbedpsHtHHh35wDFn5T48GSddgZNaWnHvjebutiE62zl8lnCKgASMewp2ltwRWT9L06LUHFZipVZOaKRU2zo9Z1rqGk2qxklp6vOfUzEVx2mpPA1xgb6e5M6sPTrOkiXjgU7K4ArdxKEu0aH7X92DsCfaB75n+kG+zXTLYyHPS1mo5cFQClNbVaH7Yknx0p4MR/LO1p8jRq7BvpniDouHF3BPThX0DL73m67Xrw5jwYO5kHRLjCFZcvXtGjf8u3fWpmyq3X7+4rxBb6omlN7RLhtdcjcDXmziU1y90svv/mpDqP2+11BoHFLkxz19+MdEHsuditPhcLtnn8faX84PvXbS3uBiDPEjpG0Iy2h0zmuOioAfw61TJPMqqvc0Pp3wIQtSKzy4w0zjJkp1tyZ3lxZL1TM4OY0dMTSL+MnpUQT0XrODt4EbfhwfQct3Gd5SrGTVoNBv3jwazAlmmgLdKQ+NxxLIwNq4h0HEPnkXe1BiHkvsmmFhPm4Wy4XsyC9l5m/TUXby4UW/LcIF5zoc4pxz8kbZbRYhO/8dRO5lz2XWMxJv7xffUHgieH1T8Va8S9o/z+a4Tg==

Steps to reproduce

• See test.ts

What is expected?

No type errors

What is actually happening?

The new version of Ref with a getter + setter creates a Union in UnwrapRef and UnwrapNestedRefs, breaking existing types

System Info

No response

Any additional comments?

The issue cannot be seen in the playground since it always uses latest Vue for TS.

[yyx990803]

Caused by e0b2975

/cc @jh-leong