[IMP] web: more lenient number parser

[caburj]

PURPOSE

Avoid faulty inputs caused by a weird parsing/detection mixup between thousand
and decimal separator. We must let go of the (wrong) assumption that people will paste
numbers into the format defined on their locale. We should not depend on the locale
for number parsing as much as possible.

The locale format will still be used for formatting of course, so this config has
its use - but parsing should be much more agnostic.

HOW

The purpose is achieved by doing the following parsing steps:

1. Parse the input using the original more strict parser using the locale.
2. If it failed in the first step, we parse again using a more lenient heuristics.

This lenient parsing heuristic follows the steps:

• Remove all the whitespaces.
• Assuming "dot" and "comma" as separators, we collect them from the input in sequence.
• If the number of separators is one
  • Check if it's a thousands separator from the locale
    • If so, remove it from the input
    • Otherwise, replace it with "dot" (as decimal point).
• If the number of separators is two
  • Check if they're the same.
    • If so, then remove them because they're thousands separators.
    • Otherwise, the first is a thousands separator and the second is decimal point.
      • Remove the thousands separator and replace the decimal point with "dot".
• If the number of separators is more than two
  • The first separators should be thousands separators while the last one is a decimal point.
  • Check if the first separators are all the same
    • If not, throw an error, the input can't be a number.
  • Check if the first separators are the same as the last
    • If so, then remove them all from the input (they're just thousands separators)
    • Otherwise, remove the thousands separators and replace the decimal point with "dot".
• Convert the resulting input to number using Number.

TASK-ID: 3092583

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