nullable is part of "allOf" instead of being separate schema key when using shared component

[Grawl]

const phoneNumber = z.string().openapi('Phone')

const mySchema = z.object({
    somePhone: phoneNumber.nullable(),
    anotherPhone: phoneNumber,
})

Expected result:

"somePhone": {
    "allOf": [
        {
            "$ref": "#/components/schemas/Phone"
        },
    ],
    "nullable": true
},
"anotherPhone": {
    "$ref": "#/components/schemas/Phone"
},

Actual result:

"somePhone": {
    "allOf": [
        {
            "$ref": "#/components/schemas/Phone"
        },
        {
            "nullable": true
        }
    ]
},
"anotherPhone": {
    "$ref": "#/components/schemas/Phone"
},

---

I am using Hono

[davidask]

@AGalabov do you have any info here? Ready to help out here if given a pointer 👍🏻