Overhaul hanzi2num

[statementreply]

Goals

• Implement digit-by-digit hanzi2num: convert from Chinese number to decimal string without computing its numerical value.
• Implement digit-by-digit num2hanzi.
• Fix bug in converting some hanzi to numbers #114
• Fix Some number keywords in hanzi2num.js are not included in parser.js #130
• Add tests

Behavior Changes

• 塵埃渺漠 are now 10x each
• The character for 10^28 is changed to 穰 (U+7A70).
• 一百一 = 101 now
• Multi-character multipliers are no longer supported.
• Omitting 一 before fractional multipliers is no longer allowed. It's unclear whether 五毫絲 means 0.0051 or 5e-7, so I just disallowed it for now.
• Allow multiple multipliers: 一萬萬 = 1e+8, 一百絲 = 0.01.
• Add support for positional notation: 一三三七 = 1337
• Add digit zero 〇 (exactly one digit of zero) and decimal separator ·: 三五〇〇·〇一 = 3500.01
• "又" can be used at more places: 三十又六 = 36

[LingDong-]

Sounds awesome, looking forward to it 👍

[statementreply]

Done

• hanzi2num: readout format
• hanzi2num: positional format
• num2hanzi: readout format

Future

• hanzi2num: reject positional format with mismatching multipliers (一萬二三四)
• hanzi2num: support omitting 一 before fractional miltipliers at the beginning (分五釐)
• hanzi2num: support 廿 etc.

Distant Future (?)

• num2hanzi: positional format, full format (no omitted zeros)
• hanzi2num and num2hanzi: scientific notation?

[LingDong-]

👍Looks very sophisticated, thanks so much! Will take a closer peek tomorrow :)