How do I query vertex attributes that are not used in shader?

Why spirv_cross::ShaderResources::stage_inputs does not contain inputs that do not used by shader(vertex stage)? I think it is important information to calculate offsets of each attribute and stride for whole vertex. Is there a way to get this information?

Start by examining ShaderResources::stage_inputs and the vertex-stage reflection behavior described in the issue. Determine whether and how unused vertex attributes should be exposed so their offsets and whole-vertex stride can be calculated; the issue is complete when the expected reflection information and its representation are clearly established.

Written by the indexing model from the issue text.