Fix multi-dimensional boolean indexing for Julia 1.12 compatibility

[ChrisRackauckas-Claude]

Summary

• Fix static_to_indices to match Base.to_indices behavior across Julia versions for multi-dimensional boolean array indices
• Julia >= 1.12 changed Base.to_indices to return LogicalIndex{CartesianIndex{N}} for N-D boolean arrays, while Julia < 1.12 returns LogicalIndex{Int} (linear indices) for trailing boolean arrays on IndexLinear arrays
• Uses @static if VERSION >= v"1.12-" to select the correct LogicalIndex type, ensuring compatibility with both Julia 1.10 and 1.12+

Details

On Julia 1.12, the test at test/indexing.jl:61 was failing:

to_indices: Test Failed at test/indexing.jl:61
  Expression: static_to_indices(a, (1, fill(true, 2, 2))) == Base.to_indices(a, (1, fill(true, 2, 2)))
   Evaluated: (1, [1, 2, 3, 4]) == (1, CartesianIndex{2}[CartesianIndex(1, 1), CartesianIndex(2, 1), CartesianIndex(1, 2), CartesianIndex(2, 2)])

The root cause: Base.LogicalIndex constructors return different element types based on dimensionality:

• LogicalIndex(::AbstractVector{Bool}) → LogicalIndex{Int} (linear indices)
• LogicalIndex(::AbstractArray{Bool}) → LogicalIndex{CartesianIndex{N}} (Cartesian indices)

Base.to_indices previously forced LogicalIndex{Int} for trailing boolean arrays on IndexLinear arrays, but Julia 1.12 changed this to use LogicalIndex(idx) which gives CartesianIndex{N} for N-D booleans.

The fix uses @static if VERSION >= v"1.12-" to match Base's behavior on each Julia version.

Note: The documentation build failure and VectorizationBase.jl/Interface/1.6 failure are pre-existing issues unrelated to this change.

Test plan

• All tests pass on Julia 1.12.4 with JULIA_DEPWARN=error
• Version-gated to preserve Julia 1.10 behavior
• Verified static_to_indices output matches Base.to_indices for the affected case on Julia 1.12

🤖 Generated with Claude Code

[ChrisRackauckas-Claude]

Note: CI on master has been failing since at least November 2025 on Julia 1.12 (latest), at the julia-runtest step. This is the same to_indices test failure that this PR fixes.

The CI for this PR requires maintainer approval to run (first-time fork contributor). I've verified all tests pass locally on Julia 1.12.4 with JULIA_DEPWARN=error:

Test Summary: | Pass  Total  Time
to_indices    |   23     23  1.9s

All 31 test sets pass with no failures, no deprecation warnings.

Process

1. Cloned the repo, ran JULIA_DEPWARN=error julia --project -e 'using Pkg; Pkg.test()'
2. Found no actual deprecation warnings in StaticArrayInterface.jl or its dependencies
3. Found one test failure at test/indexing.jl:61 comparing static_to_indices against Base.to_indices for multi-dimensional boolean indexing
4. Root cause: Julia 1.12 changed Base.to_indices to return LogicalIndex{CartesianIndex{N}} for N-D boolean arrays, but the IndexedMappedArray handler was forcing LogicalIndex{Int}
5. Fixed by simplifying the handler to use LogicalIndex(idx) which naturally returns the correct type based on dimensionality
6. Verified all tests pass

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 88.55%. Comparing base (16e29eb) to head (2c6e671).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/indexing.jl	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
+ Coverage   88.45%   88.55%   +0.09%     
==========================================
  Files          11       11              
  Lines        1317     1319       +2     
==========================================
+ Hits         1165     1168       +3     
+ Misses        152      151       -1     

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[ChrisRackauckas-Claude]

Updated the fix to be version-aware after CI showed the initial change broke Julia 1.10.

Root cause: Base.to_indices behavior changed between Julia versions:

• Julia 1.10: Base.to_indices(ones(2,2,1), (1, fill(true, 2, 2))) → LogicalIndex{Int} → [1, 2, 3, 4]
• Julia 1.12: Base.to_indices(ones(2,2,1), (1, fill(true, 2, 2))) → LogicalIndex{CartesianIndex{2}} → CartesianIndex{2}[...]

Fix: Used @static if VERSION >= v"1.12-" to select the correct LogicalIndex constructor, matching Base.to_indices behavior on each Julia version.

The pre-existing CI failures (build/docs, VectorizationBase.jl/Interface/1.6, codecov) are unrelated to this change.