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Support negative numbers in -split operator #8960

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merged 23 commits into from Jun 3, 2019

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@ece-jacob-scott
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commented Feb 23, 2019

Fixes #4765

  • Added functionality to facilitate negative arguments for the split command.
  • Added a couple tests to the split suite.

To solve the problem of negative number arguments in the split command I checked that the argument was in fact negative. If the argument is negative then the regex command gets run with the 'RightToLeft' property. This will grab the correct strings from the content and produce the correct output results. Else if the argument number is not negative then the regex is run normally.

I am competing in the HackIllinois event and was mentored by @rjmholt and @TylerLeonhardt

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commented Feb 23, 2019

CLA assistant check
All CLA requirements met.

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This looks great! I only had some minor whitespace concerns, but besides that, this looks good.

@TylerLeonhardt TylerLeonhardt changed the title Enhanced functionality connected to issue 4765 Support negative numbers in -split operator Feb 23, 2019

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commented Feb 23, 2019

@ece-jacob-scott I forgot to mention that you need to add [feature] to your commit message to trigger the additional feature tests so when you address my PR comments just do:

git commit -m "[feature] touch up whitespace and newlines"
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I think Codeacy can be ignored here -- the limit normalisation is nicer.

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commented Feb 23, 2019

Please consider support for left-to-right splitting in predicate mode as well, ie.:

PS C:\> 'a b c d' -split {$_ -like ' '},-2
a b c
d
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LGTM 😊Hope it was a good experience!

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commented Feb 24, 2019

Please open new Issue in PowerShell-Docs repo and add reference in the PR description.

$res.count | Should -Be 4
$res[0] | Should -Be "a"
$res[1] | Should -Be "b"
$res[2] | Should -Be "c"
$res[3] | Should -Be "d"

$res = "a b c d" -split " ",-8

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iSazonov Feb 24, 2019

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Why not reverse order like test in line 80?

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ece-jacob-scott Feb 24, 2019

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Agreed this is something that I noticed today while showing off my changes to the judges. I will probably come back and add another commit fixing this functionality.

Which way do you think is better? Personally I think that the first item should be at array index 0.
ie

> $r = 'a b c d' -split ' ',-2
> $r[0]
d

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Any formatting or implementation details would be greatly appreciated. Thank you! :)

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Note that splitting from right to left might be considered orthogonal to the iteration from left to right.

@mklement0's original example in #4765 is:

PS> 'a b c d' -split ' ', -2  # split into (at most) 2 strings from the end
a b c  # prefix
d        # requested token

PS> 'a b c d' -split ' ', -3  # split into (at most) 3 strings from the end
a b   # prefix
c       
d 

PS> 'a b' -split ' ', -2  # 2 resulting strings - complete split; same as 0 in this case
a
b

This implementation currently accords with that.

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Also worth noting that suggestion was approved by the @PowerShell/powershell-committee

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Test in line 80 is wrong, yes?

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@iSazonov Yes you were correct it is fixed in the most recent commits.
@rjmholt Good point, I don't have a good response for that haha.

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commented Feb 24, 2019

Please look optimizations from https://github.com/PowerShell/PowerShell/pull/5270/files

@@ -651,74 +651,104 @@ private static object SplitOperatorImpl(ExecutionContext context, IScriptExtent
}
}

private static string ReverseStringUtility(string str)

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Can we avoid the reverse?
If no please refactor the method with String.Create() to reduce allocations.

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Maybe consider iterating over the input string from right-to-left and find all predicate matches in one go, then use string.Substring() to grab the substrings without the need to reverse each sb instance

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Yes, my thoughts was about this and Span<>. If it is too hard for @ece-jacob-scott we can postpone this to follow PR.

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No, that makes sense I can work on implementing that in the next couple of days.

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Super cool @ece-jacob-scott, feel free to poke me on Twitter (or tag me here) if you need help or have questions about the previous PR for this

@iSazonov iSazonov referenced this pull request Feb 27, 2019
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commented Feb 27, 2019

The new behavior was already reviewed and approved by @PowerShell/powershell-committee, so not clear why this was marked for review again. If there is something new to review, please summarize and re-add the label.

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commented Mar 1, 2019

@TylerLeonhardt @rjmholt Please help @ece-jacob-scott to resolve merge conflicts in right way.

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commented Mar 1, 2019

@TylerLeonhardt @rjmholt Please help @ece-jacob-scott to resolve merge conflicts in right way.

So I was talking to Tyler last night about it and he helped me out however, I'm getting there build errors ever since I merged with the latest master branch.

screenshot from 2019-03-01 08-10-49

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commented Mar 1, 2019

@ece-jacob-scott There is resource errors - you need build with Start-PSBuild -ResGen. Now please wait Tyler to clean up your branch.

@ece-jacob-scott ece-jacob-scott force-pushed the ece-jacob-scott:split-negative-number branch from 627a9d9 to c96c58e May 11, 2019

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commented May 12, 2019

@ece-jacob-scott just let us know when you're ready for review :)

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commented May 31, 2019

Sorry didn't see this comment. I thought my last solution was a bit verbose so I split it into 2 functions, one for the negative split and one for the regular split.

}
}

private static object SplitWithPredicate(ExecutionContext context, IScriptExtent errorPosition, IEnumerable<string> content, ScriptBlock predicate, int limit)
private static object NegativeSplitWithPredicate(ExecutionContext context, IScriptExtent errorPosition, IEnumerable<string> content, ScriptBlock predicate, int limit)

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Any reason for object vs IReadOnlyList<string> or similar?

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No, I think that's just how it was when I got the code so I left it. Good call though.

ece-jacob-scott and others added 5 commits Jun 1, 2019
switch var to int
Co-Authored-By: Robert Holt <rjmholt@gmail.com>
switch var to int
Co-Authored-By: Robert Holt <rjmholt@gmail.com>
switch var to int
Co-Authored-By: Robert Holt <rjmholt@gmail.com>
capitalize comment
Co-Authored-By: Robert Holt <rjmholt@gmail.com>
@rjmholt
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LGTM! Thanks so much for your contribution @ece-jacob-scott!

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commented Jun 3, 2019

Has a doc issue been filed?

@rjmholt rjmholt referenced this pull request Jun 3, 2019
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commented Jun 3, 2019

Has a doc issue been filed?

Done

out of date

@TravisEz13 TravisEz13 merged commit f222a68 into PowerShell:master Jun 3, 2019

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@TravisEz13 TravisEz13 added this to the 7.0.0-preview.2 milestone Jun 3, 2019

@TravisEz13 TravisEz13 added the CL-Engine label Jun 3, 2019

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commented Jun 3, 2019

@ece-jacob-scott Thanks for your contribution!

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commented Jul 17, 2019

🎉v7.0.0-preview.2 has been released which incorporates this pull request.🎉

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Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Move some of the creations of `WildcardPattern` in outer loop to avoid unnecessary allocation (PowerShell#10053)

* Add another fast path to `WildcardPattern.IsMatch` for patterns that only have an asterisk in the end (PowerShell#10054)

* Update change log generation tool to deal with private commits (PowerShell#10096)

* Bump System.Text.Encoding.CodePages (PowerShell#10112)

Bumps System.Text.Encoding.CodePages from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Bump System.Security.AccessControl (PowerShell#10100)

Bumps System.Security.AccessControl from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Bump System.Threading.AccessControl (PowerShell#10106)

Bumps System.Threading.AccessControl from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Bump System.Data.SqlClient (PowerShell#10109)

Bumps System.Data.SqlClient from 4.7.0-preview6.19303.8 to 4.7.0-preview.19113.10.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Bump System.Management (PowerShell#10110)

Bumps System.Management from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Bump System.DirectoryServices (PowerShell#10105)

Bumps System.DirectoryServices from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Bump System.Security.Cryptography.Pkcs (PowerShell#10107)

Bumps System.Security.Cryptography.Pkcs from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Bump System.IO.Packaging (PowerShell#10108)

Bumps System.IO.Packaging from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Bump System.Security.Principal.Windows (PowerShell#10101)

Bumps System.Security.Principal.Windows from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Bump System.Security.AccessControl (PowerShell#10102)

Bumps System.Security.AccessControl from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Bump System.Configuration.ConfigurationManager (PowerShell#10111)

Bumps System.Configuration.ConfigurationManager from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Add -SecurityDescriptorSddl parameter to Set-Service (PowerShell#8626)

* Bump System.Text.Encodings.Web (PowerShell#10123)

Bumps System.Text.Encodings.Web from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Revert "Bump System.IO.Packaging (PowerShell#10108)" (PowerShell#10125)

This reverts commit 45edbd7.

* Revert "Bump System.Data.SqlClient (PowerShell#10109)" (PowerShell#10126)

This reverts commit 83d8ec4.

* Revert "Bump System.Threading.AccessControl (PowerShell#10106)" (PowerShell#10127)

This reverts commit a7f0c6d.

* Revert "Bump System.Text.Encodings.Web (PowerShell#10123)" (PowerShell#10124)

This reverts commit b9501d9.

* Revert "Bump System.Management (PowerShell#10110)" (PowerShell#10129)

This reverts commit e5990ed.

* Revert "Bump System.Security.Cryptography.Pkcs (PowerShell#10107)" (PowerShell#10130)

This reverts commit d33c906.

* Revert "Bump System.Text.Encoding.CodePages (PowerShell#10112)" (PowerShell#10131)

This reverts commit 958cdda.

* Revert "Bump System.Security.AccessControl (PowerShell#10102)" (PowerShell#10132)

This reverts commit 729a29a.

* Revert "Bump System.Configuration.ConfigurationManager (PowerShell#10111)" (PowerShell#10128)

This reverts commit c8fe894.

* Revert "Bump System.Security.Principal.Windows (PowerShell#10101)" (PowerShell#10133)

This reverts commit f75c635.

* Cleanup workflow - remove PSProxyJob (PowerShell#10083)

* Revert "Bump System.DirectoryServices (PowerShell#10105)" (PowerShell#10135)

This reverts commit 2852efc.

# Conflicts:
#	src/System.Management.Automation/System.Management.Automation.csproj

* Fix test password generation rule to meet Windows complexity requirements (PowerShell#10143)

* Cleanup CompiledScriptBlock.cs (PowerShell#9735)

* Add alias for Service 'StartType' (PowerShell#9940)

* Mark Set-Service tests with password as `Pending` (PowerShell#10146)

* Split the fxdependent package on Windows into two packages (PowerShell#10134)

* Remove 'kill' alias for Stop-Process cmdlet on Unix (PowerShell#10098)

* Identify renaming a parameter set as non-breaking in the breaking change contract document (PowerShell#10113)

* Identify renaming a parameter set as non-breaking
Related discussion: PowerShell#10058.

* Add note about S.M.A.Internal

* Update DotNet Support links (PowerShell#10145)

* Remove `markdownlint` tests due to security issues (PowerShell#10163)

* Remove `markdownlint` tests due to security issues (PowerShell#10163)

* Merged PR 5767: Fix RegEx DoS issues

Fix RegEx DoS issues

* Skip `JumpList` on `NanoServer` and `IoT` (PowerShell#10164)

* Skip `JumpList` on `NanoServer` and `IoT` (PowerShell#10164)

* Merged PR 9185: Update PowerShell SDK version for hosting tests

Update PowerShell SDK version for hosting tests

* Merged PR 9168: Disable Enter-PSHostProcess cmdlet when system in lock down mode

This is based on an issue, where Enter-PSHostProcess on a locked down (WDAC enforced) machine allows any admin to connect to any another local hosted PowerShell process and execute commands as that user. This amounts to privilege escalation on the policy locked down machine and something we want to prevent.

Fix is to check for system lock down and disable Enter-PSHostProcess cmdlet with an error message.

* Update README.md and metadata.json for next releases (PowerShell#10087)

* Add tooling section to PR template (PowerShell#10144)

* Add .devcontainer configuration (PowerShell#10114)

* Add the license header to `nanoserver.tests.ps1` (PowerShell#10171)

* Refactor security policy documentation so that they appear in the Security policy tab of GitHub (PowerShell#9905)



Co-Authored-By: Travis Plunk <travis.plunk@microsoft.com>

* PSSA also includes formatting (PowerShell#10172)

* Merged PR 9166: Update changelog for v7.0.0-preview.2

Update changelog for v7.0.0-preview.2

Updates are expected when STA / MTA change comes in.

* Fix hungarian prefix 'my' (PowerShell#9976)

* Update docs for `7.0.0-preview.2` release (PowerShell#10160)

* Update release date for `v7.0.0-preview.2` (PowerShell#10176)

* Reduce allocations in Escape() and Unescape() (PowerShell#10041)

* Add -Raw switch to Select-String for convenience (PowerShell#9901)

* Avoid boxing when passing value type arguments to `PSTraceSource.WriteLine` (PowerShell#10052)

* Fix macOS build break (PowerShell#10207)

* Use nameof() in LocationGlobber and PathInfo (PowerShell#10200)

* Use nameof() in LocationGlobber
* Use nameof() in PathInfo

* Fix: Removed dependency file with Dependabot (PowerShell#10212)

* Enable `-sta` and `-mta` switches for pwsh (PowerShell#10061)

* Use 'Platform.IsWindowsDesktop' instead of checking both NanoServer and IoT (PowerShell#10205)

* Special case the posix locale in WildcardPattern (PowerShell#10186)

* Quote arguments in `.vscode/tasks.json` in case of spaces (PowerShell#10204)

* Create`Distribution_Request` issue template (PowerShell#10253)

* Fix spelling error in issue template (PowerShell#10256)

* Revert the temporary change (PowerShell#10260)

* Bump Microsoft.CodeAnalysis.CSharp from 3.1.0 to 3.2.0 (PowerShell#10273)

Bumps [Microsoft.CodeAnalysis.CSharp](https://github.com/dotnet/roslyn) from 3.1.0 to 3.2.0.
- [Release notes](https://github.com/dotnet/roslyn/releases)
- [Changelog](https://github.com/dotnet/roslyn/blob/master/docs/Breaking%20API%20Changes.md)
- [Commits](https://github.com/dotnet/roslyn/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Cleanup: ThreadAbortException is now in .Net Core 3.0 (PowerShell#10230)

* Cleanup: ThreadAbortException is now in .Net Core 3.0

* Fix CodeFactor issue

* Remove ThreadAbortException

* Remove ThreadAbortException relared code

* Remove stable and servicing branches from dependabot (PowerShell#10289)

* Update dead links from powershell.com (PowerShell#10297)

* Remove extra check that the system dll exists (PowerShell#10244)

* Update PowerShell to build against .NET Core 3.0-preview7 (PowerShell#10227)

* Fix debugger disable performance regression (PowerShell#10269)

* Don't collect process starttime as it's not being used on consolehost startup (PowerShell#10294)

* mark _readyForInputTimeInMS member as part of LEGACYTELEMETRY
* move _interactiveCommandCount to LEGACYTELEMETRY

* Cleanup Docker release testing (PowerShell#10310)

* Update our language on our policy applying to security issues (PowerShell#10304)

* Add tests for WildcardPattern.Escape() and Unescape() (PowerShell#10090)

* Update 'Microsoft.PowerShell.CoreCLR.Eventing' to resolve conflict with 'System.Diagnostics.EventLog' (PowerShell#10305)

* Update 'Microsoft.PowerShell.CoreCLR.Eventing' to resolve conflicts
* Add reference to 'System.Diagnostics.EventLog' to build Microsoft.PowerShell.Commands.Diagnostics on Unix
* Stop compiling Get/New-WinEvent on Unix

* Enable Experimental Features by default on Preview builds (PowerShell#10228)

* Bump Microsoft.CodeAnalysis.CSharp from 3.2.0 to 3.2.1 (PowerShell#10330)

Bumps [Microsoft.CodeAnalysis.CSharp](https://github.com/dotnet/roslyn) from 3.2.0 to 3.2.1.
- [Release notes](https://github.com/dotnet/roslyn/releases)
- [Changelog](https://github.com/dotnet/roslyn/blob/master/docs/Breaking%20API%20Changes.md)
- [Commits](https://github.com/dotnet/roslyn/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Expose PreRelease label in PSModuleInfo formatter (PowerShell#10316)

* Reduce allocations in MakePath() method (PowerShell#10027)

* Add `Microsoft.PowerShell.CoreCLR.Eventing.dll` to exception list for build fix (PowerShell#10337)

* Add dispose of _runspaceDebugCompleteEvent event object. (PowerShell#10323)

* Make module name matching for `get-module -FullyQualifiedName`… (PowerShell#10329)

* Fix `#requires -version` for pwsh 7 to include 6.1 and 6.2 in `PSCompatibleVersions` (PowerShell#9943)

* Implement ForEach-Object -Parallel feature (PowerShell#10229)

* Add support for AppX reparse points (PowerShell#10331)

* Make Get-DscResource work with class based resources (PowerShell#10350)

* pwsh -Login support (PowerShell#10050)

* Deprecate internal HelpCategory.Workflow enumeration (PowerShell#10319)

* Fix style issues in InternalCommands.cs (PowerShell#10352)

* Deprecate workflow debugging code (PowerShell#10321)

* Bump NJsonSchema from 10.0.21 to 10.0.22 (PowerShell#10364)

Bumps [NJsonSchema](https://github.com/RicoSuter/NJsonSchema) from 10.0.21 to 10.0.22.
- [Release notes](https://github.com/RicoSuter/NJsonSchema/releases)
- [Commits](https://github.com/RicoSuter/NJsonSchema/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Move to .NET Core 3.0 preview.8 (PowerShell#10351)

* Update Microsoft.Management.Infrastructure version to 2.0.0-preview.2 (PowerShell#10366)

* Mark `-parallel` and `-throttlelimit` reserved for `foreach` and `switch` statements (PowerShell#10328)

* Fix minor breakpoint re-hydration bug (PowerShell#10339)

* Additional Telemetry - Implementation of `RFC0036` (PowerShell#10336)

* Formatting: Handle `XTPUSHSGR` and `XTPOPSGR` control sequences (PowerShell#10208)

* .CPL should be added to PATHEXT (PowerShell#9828)

* Add experimental check for `ForEach-Object -Parallel` tests (PowerShell#10354)

* Bump `PackageManagement` from `1.4.3` to `1.4.4` (PowerShell#10383)

Bumps PackageManagement from 1.4.3 to 1.4.4.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Bump PowerShellGet from 2.2 to 2.2.1 in /src/Modules (PowerShell#10382)

Bumps [PowerShellGet](https://github.com/PowerShell/PowerShellGet) from 2.2 to 2.2.1.
- [Release notes](https://github.com/PowerShell/PowerShellGet/releases)
- [Changelog](https://github.com/PowerShell/PowerShellGet/blob/development/CHANGELOG.md)
- [Commits](https://github.com/PowerShell/PowerShellGet/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Merged PR 9744: Update changelog for preview.3 release

Update changelog for preview.3 release

* Update `README.md` and `metadata.json` for `7.0.0-preview.3` (PowerShell#10393)

* Add `PSKoans` to Learning Resources documentation (PowerShell#10369)

* Add some regular contributors to allow access to retry CI (PowerShell#10397)

* Some dependencies for Alpine need `linux-x64` folder (PowerShell#10407)

* Block type update in Add-Type cmdlet (PowerShell#9609)

* Increase built-with-PowerShell module versions to 7.0.0.0 (PowerShell#10356)

* Rename default ParameterSetName back to `Delimiter` for `ConvertTo-Csv` & `ConvertFrom-Csv` (PowerShell#10425)

* rename default parameterset name back to `Delimiter`
* also fix convertfrom-csv
* rename parametersetname for UseCulture back to UseCulture since there is no path for ConvertFrom-Csv

* Skip auto-loading PSReadLine on Windows if the NVDA screen reader is active (PowerShell#10385)

* Bump NJsonSchema from 10.0.22 to 10.0.23 (PowerShell#10421)

Bumps [NJsonSchema](https://github.com/RicoSuter/NJsonSchema) from 10.0.22 to 10.0.23.
- [Release notes](https://github.com/RicoSuter/NJsonSchema/releases)
- [Commits](https://github.com/RicoSuter/NJsonSchema/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Add support to `ActionPreference.Break` to break into debugger (PowerShell#8205)

* Alpine validation changes (PowerShell#10428)

* Remove yet another appveyor reference (PowerShell#10445)

* Update the combined package build to release the daily builds (PowerShell#10449)

* Cleanup `AutomationEngine` and remove extra `SetSessionStateDrive` method call (PowerShell#10416)

* Make sure the daily coordinated build, knows it is a daily bui… (PowerShell#10464)

* Minor fix for recursion into OneDrive - Change FindFirstFileEx() to use SafeFindHandle type (PowerShell#10405)

* Update README.md (PowerShell#10465)

Fix typo.

* Make `ForEach-Object` faster for its commonly used scenarios (PowerShell#10454)

* Fix global tool issues around exit code, command line parameters and path with spaces (PowerShell#10461)
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