[Rafael-SOWNet]

Compile<double, ...> and Compile<float, ...> took a power with Math.Pow, for which NaN^0 and 1^NaN are 1. So a power of a value that does not exist had one. A power whose base or exponent is NaN is now NaN, as it is in evaluation, in FastExpression and in the compilers over Complex (#2225).

at 0.7, over double	2.6.0 and master	this branch, and evaluation
(x provided x > 1)^0	1	NaN
1^(x provided x > 1)	1	NaN
((x provided x > 1)^Im(x)) * sin(-2)	-0.909	NaN

Over double, a NaN also stands for a value that is not real. So (sqrt(x - 2))^0 at 0.7, which is 1, was 1 only by Math.Pow's rule and is now NaN, as sqrt(x - 2) + 1 - sqrt(x - 2) already was there. The change trades a coincidental answer for a decline, and removes a value where there is none.

Not changed here: 0^0 and 0^(-1) over double stay Math.Pow's 1 and +oo, just as 1/0 over double is still +oo. FastExpression and Complex have no value at either (#2225, #2235). Whether the double compiler should follow is a separate decision.

PowerOfNaNOverDoubleTest: six cases with no value fail on master, and four cases with a value pass on both. Suite 18177 passed. The F# wrapper suite, the Mcp, Terminal and InteractiveWrapper suites and the AOT smoke test pass.

Fixes #2250.

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.70%. Comparing base (bd750c4) to head (830e844).
⚠️ Report is 1 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    #2252      +/-   ##
==========================================
- Coverage   86.71%   86.70%   -0.02%     
==========================================
  Files         310      310              
  Lines       67785    67785              
  Branches    19664    19666       +2     
==========================================
- Hits        58781    58773       -8     
- Misses       4892     4899       +7     
- Partials     4112     4113       +1     

Flag	Coverage Δ
cpp	37.77% <ø> (ø)
csharp	87.25% <50.00%> (-0.02%)	⬇️
fsharp	32.97% <ø> (ø)
interactive	40.72% <ø> (ø)

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Files with missing lines	Coverage Δ
...h/Functions/Compilation/IntoLinq/MathAllMethods.cs	73.97% <50.00%> (ø)

... and 5 files with indirect coverage changes

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