Fix nested spread prop variance, issue 7242 #7296
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Fixes #7242
Currently broken examples which this PR fixes:
first test case
second test case
I'm not entirely sure wether test cases are in right file or should I have separate file for them, but that file has probably the closest test cases to ones I made.
I'm also not sure wether
flow_opt cx ?trace (DefT (lreason, lt), UseT (use_op, DefT (ureason, ut)))
is proper call in matches, or should I have there something else instead.