Fix TypeVar Bug

[willtebbutt]

I believe that this resolves #282 .

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
src/fwds_rvs_data.jl	96.52% <100.00%> (+0.04%)	⬆️

[github-actions]

Performance Ratio:
Ratio of time to compute gradient and time to compute function.
Warning: results are very approximate! See here for more context.

┌────────────────────────────┬──────────┬─────────┬─────────────┬─────────┐
│                      Label │ Mooncake │  Zygote │ ReverseDiff │  Enzyme │
│                     String │   String │  String │      String │  String │
├────────────────────────────┼──────────┼─────────┼─────────────┼─────────┤
│                   sum_1000 │     71.9 │     1.0 │        5.41 │ missing │
│                  _sum_1000 │     6.82 │  1320.0 │        34.5 │ missing │
│               sum_sin_1000 │      2.3 │     1.7 │        10.6 │ missing │
│              _sum_sin_1000 │     2.71 │   270.0 │        13.6 │ missing │
│                   kron_sum │     81.2 │    4.79 │       265.0 │ missing │
│              kron_view_sum │     51.4 │    7.03 │       160.0 │ missing │
│      naive_map_sin_cos_exp │     2.53 │ missing │        7.52 │ missing │
│            map_sin_cos_exp │      2.7 │    1.54 │        5.96 │ missing │
│      broadcast_sin_cos_exp │      2.6 │     3.0 │        1.46 │ missing │
│                 simple_mlp │     7.52 │    3.24 │        11.8 │ missing │
│                     gp_lml │     11.1 │    6.31 │     missing │ missing │
│ turing_broadcast_benchmark │     3.77 │ missing │        26.8 │ missing │
│         large_single_block │     4.14 │  4260.0 │        31.4 │ missing │
└────────────────────────────┴──────────┴─────────┴─────────────┴─────────┘