import
preserves
type
Foo* {.preservesRecord: "foo".} = object
`x`*: seq[string]
`y`*: BiggestInt
`z`*: BiggestInt
proc `$`*(x: Foo): string =
`$`(toPreserves(x))
proc encode*(x: Foo): seq[byte] =
encode(toPreserves(x))