HNSW default vector TYPE: documentation states F64 in three places, but v3.2.0 materialises TYPE F32 when TYPE is omitted

[RobertSigmundsson]

Affected files: src/content/learn/data-models/vector-search/vector-indexes.mdx (parameter table + "Defaults to:" example), src/content/reference/query-language/statements/define/indexes.mdx

The documentation states in three places that the default vector element type for HNSW indexes is F64:

1. vector-indexes.mdx, parameter table: | TYPE | F64 | F64, F32, I64, I32, I16 | Vector type
2. vector-indexes.mdx, expanded-defaults example: DEFINE INDEX hnsw_idx ON pts FIELDS point HNSW DIMENSION 4 DIST EUCLIDEAN TYPE F64 EFC 150 M 12 M0 24 LM 0.402…;
3. define/indexes.mdx: "In SurrealDB the default type for vectors is F64."

Observed on SurrealDB v3.2.0 (official Docker image): defining an HNSW index without TYPE and exporting the database shows the index materialised with TYPE F32:

DEFINE INDEX hx ON pts FIELDS point HNSW DIMENSION 4 DIST EUCLIDEAN EFC 150 M 12;

surreal export then contains:

DEFINE INDEX hx ON pts FIELDS point HNSW DIMENSION 4 DIST EUCLIDEAN TYPE F32 EFC 150 M 12 M0 24 LM 0.40242960438184466f;

Could you confirm which side reflects the intent?

• If F32 is the intended default (it halves the resident memory of the in-RAM HNSW graph, which seems sensible), the three documentation spots should be updated to F32.
• If F64 is intended, this looks like an engine defaulting bug and I would be happy to refile against surrealdb/surrealdb.