Error: Unsupported PostGIS modifier --> ?

### Summary

what is _ ```Error: Unsupported PostGIS modifier``` _ in
```
export const getGISTypeDetails = (modifier: number): GISTypeDetails => {
const allZeroesHopefully = modifier >> 24;
if (allZeroesHopefully !== 0) {
throw new Error("Unsupported PostGIS modifier");
}
[...]
```

### Steps to reproduce
Versioning (latest & greatest?)
```
Node.js version: v18.6.0 on linux x64

postgraphile -V 4.12.11

CREATE EXTENSION IF NOT EXISTS postgis SCHEMA public VERSION "3.2.1";

PostgreSQL 14.4 (Debian 14.4-1.pgdg110+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 10.2.1-6) 10.2.1 20210110, 64-bit

```
Error:

```
graphql_1 | Error: Unsupported PostGIS modifier
graphql_1 | at exports.getGISTypeDetails (/usr/local/lib/node_modules/@graphile/postgis/dist/utils.js:7:15)
graphql_1 | at getGisType (/usr/local/lib/node_modules/@graphile/postgis/dist/PostgisRegisterTypesPlugin.js:117:41)
graphql_1 | at /usr/local/lib/node_modules/@graphile/postgis/dist/PostgisRegisterTypesPlugin.js:206:20
graphql_1 | at Object.getGqlTypeByTypeIdAndModifier (/usr/local/lib/node_modules/postgraphile/node_modules/graphile-build-pg/node8plus/plugins/PgTypesPlugin.js:816:26)
graphql_1 | at fieldWithHooks.pgFieldIntrospection (/usr/local/lib/node_modules/postgraphile/node_modules/graphile-build-pg/node8plus/plugins/PgColumnsPlugin.js:106:30)
graphql_1 | at fieldWithHooks (/usr/local/lib/node_modules/postgraphile/node_modules/graphile-build/node8plus/makeNewBuild.js:483:29)
graphql_1 | at /usr/local/lib/node_modules/postgraphile/node_modules/graphile-build-pg/node8plus/plugins/PgColumnsPlugin.js:97:22
graphql_1 | at Array.reduce ()
graphql_1 | at /usr/local/lib/node_modules/postgraphile/node_modules/graphile-build-pg/node8plus/plugins/PgColumnsPlugin.js:86:44
graphql_1 | at SchemaBuilder.applyHooks (/usr/local/lib/node_modules/postgraphile/node_modules/graphile-build/node8plus/SchemaBuilder.js:264:20)
```

### Expected results
Plugin loads

### Actual results

Plugin "unsupported"

### Additional context

Recently built postgis with postgresql database. Far as I can tell, _everything_ is up to date. The error appears related to the specific code bit, without any comment on the context of the `allZeroesHopefully`.

Definitely willing to debug further if guidance is provided.