ctxerrors v0.6.0 — 16 more general-purpose commerr sentinels commerr grows from 45 to 61 sentinels: ErrReadFailed/ErrOpenFailed/ErrCloseFailed/ ErrExecFailed, ErrNotImplemented/ErrUnsupported, ErrValidationFailed/ErrOutOfRange, ErrClosed/ErrNotReady/ErrInvalidState/ErrExpired, ErrLockHeld/ErrConflict/ ErrExhausted, and ErrPermissionDenied. All transport- and domain-agnostic, plain errors.New values matched with errors.Is. Nothing existing changed.