Nobuyoshi Nakada comments

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                                            Nobuyoshi Nakada

onメソッドのショートオプション・ロングオプションが引数を取る場合について追記

スペースを含む記号のみのケースの動作は今後も保証するものではありません。

Couldn't build the extension with Visual C++

`append_cflags` adds each flag to `$CFLAGS` only if it is usable.

Use -std=gnu99 instead of -std=c99

The reason is `test-bundled-gems.rb` runs the built ruby without `fake.rb` to build the gems. Now these extensions are generated under `.bundle` directory by `make build-exts`, and the test can use...

Prefer canonical qualified names for classes under `Thread`

@eregon Filled the description.

Pre-Gregorian dates

- Is `0000-12-31` a valid date?

Pre-Gregorian dates

I think the proleptic Gregorian calendar is the only choice pragmatically. Extensions for Julian calendar and BC times may be possible, but I'm not sure.

Ruby can't compile with psych when libyaml isn't installed

Doesn’t `make extract-extlubs` after `configure` make `ext/psych/yaml-2.5`? Then `ext/psych/extconf.rb` should fall back to it. Note that downloading in `extconf.rb` is for the separate repositories.

Ruby can't compile with psych when libyaml isn't installed

@eileencodes > > Doesn’t make extract-extlubs after configure make ext/psych/yaml-2.5? > > I think you meant extlibs but I'm sure what's not working right. Sorry, yes, it is. > When...

Ruby can't compile with psych when libyaml isn't installed

@XrXr Those lines seem coming from the original libyaml source, [`Makefile.in`](https://github.com/yaml/libyaml/commit/d12ce2aa8851d3bf75fd57dd1758181210b16456#diff-0462e381b2fb3286568215681c8983490a37ac9ae0f0c5ee304df7fa6426d4afR38-R44). Could your report it there?

Dump Date/DateTime as proleptic Gregorian date as well as Time

The [YAML spec] does not seem to mention about calendar systems at all. [YAML spec]: https://yaml.org/spec/