Arutyunyan Artyom (2018-04-25T15:45:53.000Z)
artalar at ya.ru (2018-04-25T15:48:49.626Z)
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spread assignment not mutate, it reassign, like "+=" and other.
if (
('a = {...a,...b}'.length > 'a ...= b'.length) === ('n = n+1'.length > 'n += 1'.length)
) { console.log('why "addition assignment" is necessary, but "spread assignment" is not?'); }