Are ECN counts per pn_space or unified across pn_spaces?

[YuanshanZ]

Are ECN counts in ACK frames per pn_space or unified across pn_spaces? I've observed different behaviors of public servers regarding that.

[13.3.1. ECN Counts] seems to suggest they are per pn_space:

Each packet number space maintains separate acknowledgement state and separate ECN counts. For example, if one each of an Initial, 0-RTT, Handshake, and 1-RTT QUIC packet are coalesced, the corresponding counts for the Initial and Handshake packet number space will be incremented by one and the counts for the 1-RTT packet number space will be increased by two.

However, [19.3.2. ECN Counts] says:

The three ECN Counts are:
ECT(0) Count:
A variable-length integer representing the total number of packets received with the ECT(0) codepoint.
ECT(1) Count:
A variable-length integer representing the total number of packets received with the ECT(1) codepoint.
CE Count:
A variable-length integer representing the total number of packets received with the CE codepoint. 

Pseudocode in the recovery draft (Appendix B. Congestion Control Pseudocode) also has a global ecn_ce_counter.

[janaiyengar]

Thanks for the issue, @YuanshanZ, PR looks good.