Rename types and variables used for packet number space. Quote: Conceptually, a packet number space is the context in which a packet can be processed and acknowledged. ngx_quic_namespace_t => ngx_quic_send_ctx_t qc->ns => qc->send_ctx ns->largest => send_ctx->largest_ack The ngx_quic_ns(level) macro now returns pointer, not just index: ngx_quic_get_send_ctx(c->quic, level) ngx_quic_retransmit_ns() => ngx_quic_retransmit() ngx_quic_output_ns() => ngx_quic_output_frames()