[go1.20] "cannot convert PadTo(x, 64) (value of type []byte) to type [64]byte"

[gg718]

I have github.com/prysmaticlabs/prysm/[email protected] added as a dependency in my go.mod, and I'm trying to upgrade my project from go1.19 to go1.20 and am getting the following error:

# github.com/prysmaticlabs/prysm/v3/encoding/bytesutil
/go/pkg/mod/github.com/prysmaticlabs/prysm/[email protected]/encoding/bytesutil/bytes_go120.go:12:17: cannot convert PadTo(x, 4) (value of type []byte) to type [4]byte: conversion of slices to arrays requires go1.20 or later (-lang was set to go1.19; check go.mod)
/go/pkg/mod/github.com/prysmaticlabs/prysm/[email protected]/encoding/bytesutil/bytes_go120.go:19:18: cannot convert PadTo(x, 20) (value of type []byte) to type [20]byte: conversion of slices to arrays requires go1.20 or later (-lang was set to go1.19; check go.mod)
/go/pkg/mod/github.com/prysmaticlabs/prysm/[email protected]/encoding/bytesutil/bytes_go120.go:26:18: cannot convert PadTo(x, 32) (value of type []byte) to type [32]byte: conversion of slices to arrays requires go1.20 or later (-lang was set to go1.19; check go.mod)
/go/pkg/mod/github.com/prysmaticlabs/prysm/[email protected]/encoding/bytesutil/bytes_go120.go:33:18: cannot convert PadTo(x, 48) (value of type []byte) to type [48]byte: conversion of slices to arrays requires go1.20 or later (-lang was set to go1.19; check go.mod)
/go/pkg/mod/github.com/prysmaticlabs/prysm/[email protected]/encoding/bytesutil/bytes_go120.go:40:18: cannot convert PadTo(x, 64) (value of type []byte) to type [64]byte: conversion of slices to arrays requires go1.20 or later (-lang was set to go1.19; check go.mod)
/go/pkg/mod/github.com/prysmaticlabs/prysm/[email protected]/encoding/bytesutil/bytes_go120.go:47:18: cannot convert PadTo(x, 96) (value of type []byte) to type [96]byte: conversion of slices to arrays requires go1.20 or later (-lang was set to go1.19; check go.mod)

bytes_go120.go seems to be ready for go1.20 (PR #11838 by @prestonvanloon) but the go.mod still references go1.19, which is causing compilation issues for projects using go1.20+.

[prestonvanloon]

@gg718 There may be several requirements to update prysm to 1.20. Let's close this in favor of #12043 which is a broader support issue for go1.20.