Fix isnan for NamedTuple distributions

[penelopeysm]

Fixes #898

Not gonna bother requesting reviews, IMO this is trivial enough

[github-actions]

Benchmark Report for Commit c87637a

Computer Information

Julia Version 1.11.5
Commit 760b2e5b739 (2025-04-14 06:53 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 4 × AMD EPYC 7763 64-Core Processor
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, znver3)
Threads: 1 default, 0 interactive, 1 GC (on 4 virtual cores)

Benchmark Results

|                 Model | Dimension |  AD Backend |      VarInfo Type | Linked | Eval Time / Ref Time | AD Time / Eval Time |
|-----------------------|-----------|-------------|-------------------|--------|----------------------|---------------------|
| Simple assume observe |         1 | forwarddiff |             typed |  false |                  9.7 |                 1.6 |
|           Smorgasbord |       201 | forwarddiff |             typed |  false |                628.4 |                41.5 |
|           Smorgasbord |       201 | forwarddiff | simple_namedtuple |   true |                428.4 |                45.9 |
|           Smorgasbord |       201 | forwarddiff |           untyped |   true |               1262.7 |                27.1 |
|           Smorgasbord |       201 | forwarddiff |       simple_dict |   true |               3293.8 |                25.8 |
|           Smorgasbord |       201 | reversediff |             typed |   true |               1491.9 |                29.9 |
|           Smorgasbord |       201 |    mooncake |             typed |   true |                970.3 |                 5.3 |
|    Loop univariate 1k |      1000 |    mooncake |             typed |   true |               5608.7 |                 4.0 |
|       Multivariate 1k |      1000 |    mooncake |             typed |   true |               1024.3 |                 8.9 |
|   Loop univariate 10k |     10000 |    mooncake |             typed |   true |              63032.5 |                 3.7 |
|      Multivariate 10k |     10000 |    mooncake |             typed |   true |               9159.4 |                 9.6 |
|               Dynamic |        10 |    mooncake |             typed |   true |                149.8 |                10.8 |
|              Submodel |         1 |    mooncake |             typed |   true |                 25.7 |                 8.3 |
|                   LDA |        12 | reversediff |             typed |   true |                476.5 |                 5.3 |

[coveralls]

Pull Request Test Coverage Report for Build 14607227935

Details

• 3 of 4 (75.0%) changed or added relevant lines in 1 file are covered.
• 47 unchanged lines in 13 files lost coverage.
• Overall coverage decreased (-0.01%) to 84.878%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/debug_utils.jl	3	4	75.0%

Files with Coverage Reduction	New Missed Lines	%
ext/DynamicPPLEnzymeCoreExt.jl	1	0.0%
ext/DynamicPPLForwardDiffExt.jl	1	63.64%
src/sampler.jl	1	89.23%
src/varnamedvector.jl	1	90.1%
src/logdensityfunction.jl	2	52.27%
src/utils.jl	2	73.7%
src/contexts.jl	3	64.62%
src/model.jl	3	84.17%
src/values_as_in_model.jl	3	59.52%
src/simple_varinfo.jl	6	75.14%

Totals
Change from base Build 14449056171:	-0.01%
Covered Lines:	3261
Relevant Lines:	3842

---

💛 - Coveralls