purposely left undefined, since different data planes have different
                                    capabilities. However, it is *recommended* that implementations should
                                    match against the first value of the param if the data plane supports it,

    merged[indices[m], ...] = data[m][...]

    # Vector indices:
    merged[indices[m][i], ...] = data[m][i, ...]
```

Each `data[i].shape` must start with the corresponding `indices[i].shape`,
and the rest of `data[i].shape` must be constant w.r.t. `i`.  That is, we
must have `data[i].shape = indices[i].shape + constant`.  In terms of this
`constant`, the output shape is

Class <org.gradle.api.internal.artifacts.ivyservice.ivyresolve.parser.data.MavenDependencyKey> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (MavenDependencyKey.java:0)
Class <org.gradle.api.internal.artifacts.ivyservice.ivyresolve.parser.data.PomDependencyMgt> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (PomDependencyMgt.java:0)