Trace RFC Number Allocation

[doitian]

This issue trace RFC number allocation to avoid conflicts.

If you want to submit an RFC, please leave a comment here to reserve an RFC number first.

Number PR

• [ ] 40 #290
• [ ] 41 #335
• [x] 42 #343
• [x] 43 #349
• [x] 44 #370
• [x] 45 #375
• [x] 46 ~~Rejected~~
• [ ] 47 Available
• [x] 48 #416
• [x] 49 #419
• [x] 50 #418
• [x] 51 #417
• [ ] 52 #428
• [ ] 53 #442
•  54 Available Since Here

[janx]

PR#333 is closed and replaced by https://github.com/nervosnetwork/rfcs/pull/335

[XuJiandong]

reserve RFC number (42) for https://github.com/nervosnetwork/rfcs/pull/343

[zhangsoledad]

reserve RFC number (48) for https://github.com/nervosnetwork/rfcs/pull/416 reserve RFC number (49) for https://github.com/nervosnetwork/rfcs/pull/419 reserve RFC number (50) for https://github.com/nervosnetwork/rfcs/pull/418 reserve RFC number (51) for https://github.com/nervosnetwork/rfcs/pull/417

[XuJiandong]

reserve RFC number (52) for Extensible UDT(xUDT)