Lwt.6.1.0, Lwt_ppx.6.1.0

Additions

• Lwt_engine.engine_id: a mechanism to identify which engine is currently in use. (#1097)

Changes

• When ?set_tcp_nodelay is not set explicitly, it sets TCP_NODELAY but ignores EOPNOTSUPP errors. (Simon Cruanes, #1092)

Fixes

• lwt_ppx: correctly carry type annotations again (broken since in 5.9.2). (Pierre Villemot, #1091)
• Fix build on some windows setups. (Kate Deplaix, #1095, #1082)
• Fix data-race in Lwt's internals. (Olivier Nicole, #1094, #1026)
• Fix spelling mistakes in documentation. (Tim McGilchrist, #1093)