curl + IPv6: common errors using direct IP

FAIL!

$ curl -6 "http://a00:1450:4007:805::1018/" 
curl: (3) IPv6 numerical address used in URL without brackets 

FAIL!

$ curl -6 "http://[a00:1450:4007:805::1018]/"
curl: (3) [globbing] bad range in column 13

BINGO!

$ curl -g -6 "http://[2a00:1450:4007:805::1018]/"

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