[Rafael-SOWNet]

log(0, x) evaluated to 0 for a positive x, and compiled to (-0, -0). Both took it as ln(x) / ln(0), which is ln(x) / (-oo). But 0 is not a base: no power of it is anything but 0, and Logf's own condition already excluded it. An exact zero base is now NaN in Number.Log, ComplexBranches.Log and the LINQ compiler's double and float Log. A base that is small but not 0 keeps its logarithm, so the check is for an exact zero, not IsZero's tolerance.

	2.6.0	master	this branch
"log(0, 2)".ToEntity().Evaled	0	0	NaN
"log(0, 1)".ToEntity().Evaled		0	NaN
"log(x, 2)".ToEntity().Compile("x").Call(0)	(-0, -0)	(-0, 0)	(NaN, 0)

Over double, Math.Log already gave NaN except for an antilogarithm of 1, where it gave -0.

The second commit is from BoundCheck in CI. log(b, 1) simplified to 0 provided not b = 1, which is 0 at b = 0. It now provides not b = 0 as well, as log's condition does, and BoundCheck has 0 disagreements again.

LogarithmToBaseZeroTest: seven cases fail on master, and six pass on both (three are logarithms to other bases). Suite 18185 passed. The F# wrapper suite, the Mcp, Terminal and InteractiveWrapper suites and the AOT smoke test pass. Found by work/domaincheck.

Fixes #2255.

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.72%. Comparing base (b035ed1) to head (e3ffadc).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...h/Functions/Compilation/IntoLinq/MathAllMethods.cs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2258   +/-   ##
=======================================
  Coverage   86.71%   86.72%           
=======================================
  Files         310      310           
  Lines       67790    67799    +9     
  Branches    19666    19670    +4     
=======================================
+ Hits        58786    58796   +10     
+ Misses       4892     4891    -1     
  Partials     4112     4112           

Flag	Coverage Δ
cpp	37.77% <ø> (ø)
csharp	87.27% <93.33%> (+<0.01%)	⬆️
fsharp	32.97% <ø> (ø)
interactive	40.72% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...uriMath/Core/Entity/Continuous/Number/Operators.cs	90.79% <100.00%> (+0.03%)	⬆️
...gouriMath/Functions/Compilation/ComplexBranches.cs	100.00% <100.00%> (ø)
...nuous/Evaluation.Continuous.Arithmetics.Classes.cs	87.01% <100.00%> (+0.03%)	⬆️
...h/Functions/Compilation/IntoLinq/MathAllMethods.cs	73.97% <50.00%> (ø)

... and 4 files with indirect coverage changes

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