Merge pull request ipfs/boxoipfs/interface-go-ipfs-core#76 from ipfs/fix/check-error-as-string

fix: check errors by string This commit was moved from ipfs/interface-go-ipfs-core@275b80e1f34ead0fb06a9216e3bffee57a01b636 This commit was moved from ipfs/boxo@9c1a747a2fed16388fb6f9785bb5c0ea95c88313