Tests update
[mcs] Imported methods need to have SpecialName flag to be valid C# operators
[system] Fix valid sorted set operations which could cause underlying tree modification
Fix typo
[corlib] Reset List enumerator current field. Fixes #17760
Fixed incomplete decompression bug in System.IO.Compression.DeflateStream.

Call zlib's inflate() even if no data was read from the stream, there might still be some data left to process.

Originally reported by Eric Roller, as Xamarin bugzilla #17183.
https://bugzilla.xamarin.com/show_bug.cgi?id=17183

Reviewed by Rodrigo Kumpera.
[corlib] Improve TimeSpan custom formatting. Fixes #17699
[corlib] Fix warnings
[corlib] Unicode numbers are not considers valid in number parsing. Fixes #17628
Fixes commit a63d0009af9a85c1d52475a1a9bffda34302f0b0
Revert "[jit] Fix a regression introduced by b3f36681c72a6900cd5e9df9b593d555b351669f."

This reverts commit d50c836721f22df74a45185d51d0b9d37c370e33.

Revert this as d50c836721f22df74a45185d51d0b9d37c370e33 breaks mt.
Revert "[jit] Implement OP_CARD_TABLE_WBARRIER on ios."

This reverts commit b3f36681c72a6900cd5e9df9b593d555b351669f.

Revert this as it breaks mt.
HttpListener now listens on default ports if not specified instead of random
[corlib] Throw CultureNotFoundException using invariant culture. Fixes #17690
Merge pull request #891 from DavidKarlas/listenerprefix

HttpListener now listens on default ports if not specified instead of random
[mcs] Add nested types handling to check whether types unify for some type parameter substitutions. Fixes #17647
Properly preserve VPF registers in iOS. Fixes #17793.
[mcs] Add NamespaceExpression to avoid problems with error location for misused namespaces. Fixes #17803
Add unit test for AggregateException.GetBaseException that works on .net but is broken on Mono.
Merge pull request #900 from Blewzman/FixAggregateExceptionGetBaseException

Add unit test for AggregateException.GetBaseException that works on .net but is broken on Mono.