As an editor, I want to be able to edit negative quantity amounts easily, in order to fix them if they’re wrong.
**Problem:**
Wikibase uses the character − (U+2212 MINUS SIGN) to format negative quantities (instead of - U+002D HYPHEN-MINUS), but does not recognize this character when parsing quantities (at least in English). This means that after entering a negative quantity as e.g. “-10”, trying to edit it again presents it as “−10”, and changing it to e.g. “−11” doesn’t permit saving (the “publish” button is disabled) – you have to manually change the minus sign and save “-11”.
**Example:**
Can be tested easily enough on the sandbox item.
**Screenshots/mockups:**
{F34095030}
{F34095034}
{F34095032}
{F34095033}
{F34095031}
{F34095035}
**BDD**
GIVEN
AND
WHEN
AND
THEN
AND
**Acceptance criteria:**
* Wikibase parses − as a negative sign for quantities.
**Open questions:**
* Are any other characters affected? Keeping in mind that quantity formatting is localized.