std.math.big.int.Managed: adjust size of arg for limbs_buffer in format() #19959
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… default location Information about installed MSVC instances are stored in `state.json` files within a `Packages/_Instances` directory. The default location for this is `%PROGRAMDATA%\Microsoft\VisualStudio\Packages\_Instances`. However, it is possible for the Packages directory to be put somewhere else. In that case, the registry value `HKLM\SOFTWARE\Microsoft\VisualStudio\Setup\CachePath` is set and contains the path to the Packages directory. Previously, WindowsSdk did not check that registry value. After this commit, the registry value `HKLM\SOFTWARE\Microsoft\VisualStudio\Setup\CachePath` is checked first, which matches what ISetupEnumInstances does (according to a Procmon log).
Now, an options struct is used to determine whether or not KEY_WOW64_32KEY should be set when opening a registry key.
poypoyan
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Fixes: #19787
Error occurs because in the current code, the size of
limbs(hard-coded to 128) can be less than thecalcToStringLimbsBufferLen, which is the minimum according totoString()documentation.Also updated the doc and added tests for "(BigInt)" printing.