Omitzero not working with NewUpdate SET

[soheeeeP]

According to the docs, Omitzero for NewUpdate is to update columns only when it does not contain an empty value. but it seems to work properly only when using a struct object (not working when using theSet method)

type User struct {
    ID                 int64  `bun:",pk,autoincrement"`
    Description        string `bun:"type:text,nullzero,notnull"`
    Count              int64          `bun:"default:0,notnull,nullzero"`
}

Example of a struct object which contains an empty value: it works

updateUser := &model.User{
    ID:          ID,
    Count:              count,
}

if _, err := db.NewUpdate().Model(updateUser).
    OmitZero().WherePK().Returning("*").Exec(ctx); err != nil {
    return nil, err
}

Example of using Set method in order to define fields to update:

var updateUser *model.User
if _, err := db.NewUpdate().Model(&updateUser).
        Set("count = ?", count) 
    OmitZero().WherePK().Returning("*").Exec(ctx); err != nil {
    return nil, err
}

As Golang uses zero value as nil for integer and float, the count field must not be included in the update query but it generates the query like: UPDATE "user" AS "user" SET count = 0 WHERE (id = 'id' ) RETURNING * which seems OmitZero option is not properly applied for the empty integer value.

Is this by design or an issue?