Lean Kernel Arena / sparse-name-index

Lean4export will create internalization-table references contiguously in order: in references for names, il references for levels, and ie references for expressions all work this way.

However, the spec merely requires that these are integers. It's reasonable for an implementation to assume these are approximately dense (and to treat them as array indices instead of hashtable entries), but a kernel should handle skipped indices or out-of-order indices.

This test checks that a kernel doesn't require internalization-table references to be assigned sequentially starting from 1. If the "2" and "4" were replaced by "1" and "0", respectively, this would be the expected encoding of axiom foo : Prop. This encoding should be equivalent.