Stringex fix yaml reserved words2

[giga811]

Hi again @rsl .

Seems my investigation was incomplete 😅 I missed another 2 parsing errors, sorry for the consecutive PRs 🙏
There is 2 fixes in this PR.

1. quote on
2. quote -

previous PR: #200

About quoting on

In yaml, on, off are also converted to true and false.
So I quoted all on occurences. Fortunately there was no off unidecode.

Example:

stringex/lib/stringex/unidecoder_data/x09.yml

Lines 18 to 20 in cdab2e0

	- ai
	- oN
	- o

[11] pry(main)> '0910'.to_i(16).chr.to_url
=> "ai"
[12] pry(main)> '0911'.to_i(16).chr.to_url
=> "true"
[13] pry(main)> '0912'.to_i(16).chr.to_url
=> "o"

About quoting -

And also yaml - - is parsing error. So also quoted -.
(- -- was not error)

Example:

stringex/lib/stringex/unidecoder_data/x20.yml

Lines 66 to 69 in cdab2e0

	- -
	- '^'
	- '***'
	- --

It became nil in original unidecode gem and I guess stringex uses to_s to decode it and it became empty string "". '2040'.to_i(16).chr.to_ascii should become "-"

stringex to_ascii method:

[29] pry(main)> '2040'.to_i(16).chr.to_ascii
=> ""
[30] pry(main)> '2041'.to_i(16).chr.to_ascii
=> "^"
[31] pry(main)> '2042'.to_i(16).chr.to_ascii
=> "***"
[32] pry(main)> '2043'.to_i(16).chr.to_ascii
=> "--"

unidecode to_ascii method:

irb(main):096:0> '2040'.to_i(16).chr.to_ascii
=> "[nil]"

[giga811]

The true/false thing seems only for on/off, yes/no
https://github.com/ruby/psych/blob/aec5469ef4a784e185e4e18ea542f3b5ef0f602f/lib/psych/scalar_scanner.rb#L52-L55

I skimmed all the files and seems these are the only yaml parsing errors.

I saw few symbols didn't have the quotations while original ascii version of the character was quoted. But seems - was the only symbol having error.

Quoted Ascii chars

stringex/lib/stringex/unidecoder_data/x00.yml

Lines 63 to 66 in cdab2e0

	- '='
	- '>'
	- '?'
	- '@'

Some symbols aren't quoted:

stringex/lib/stringex/unidecoder_data/x20.yml

Lines 124 to 128 in cdab2e0

	- +
	- -
	- =
	- (
	- )

[rsl]

please don't be sorry for consecutive PR. i appreciate this work. thanks!

[rsl]

please explain? thanks