Three commits since v2.7.1:

- #397 biological_type, fruit_shape, sexuality and inflorescence_type get an
  enum, numbered from 1, filterable and sortable by label and exposed in the
  species payload. Carries the one migration in this release: sexuality loses
  its NOT NULL DEFAULT 0 and the 464,186 zeros become NULL, in batches outside
  a transaction (42 s on a restore of the production dump). Additive for the
  running code, so the canary flow applies. The species search index mapped
  sexuality as a number: a full reindex must run after the switch and before
  the four columns are promoted.
- #400 fact promotion reads comma-separated flag lists ("annual, perennial")
  and refuses unknown flags instead of saving 0 and counting it as promoted.
- #401 dalli 5.0.2 to 5.0.10, for its security advisories.