on99

Results 6 issues of on99

is it possible to support `not` operation? https://en.wikipedia.org/wiki/Bitwise_operation#NOT

enhancement

```go c := column.NewCollection() c.CreateColumn("a", column.ForString()) c.CreateColumn("b", column.ForString()) c.CreateIndex("a_1", "a", func(r column.Reader) bool { return r.String() == "1" }) c.CreateIndex("a_2", "a", func(r column.Reader) bool { return r.String() == "2" })...

enhancement

As @yyoncho pointed out in [gitter](https://gitter.im/emacs-lsp/lsp-mode?at=5fb9ee93fe857d71dc896145), lsp-treemacs cannot handle nested project roots properly

I found it impossible to generate interface from current package