Constructors as methods:
$t[^table::create{data
data1
data2}]
1. table cleared: ^t.create{} ^json:string[$t]
$h[ $.1[1] $.2[2] ]
2. hash kept: ^h.create[] ^json:string[$h]
or added : ^h.create[ $.3[3] ] ^json:string[$h]
or ignored ^h.create[$h] ^json:string[$h]
$a[1;2]
3. array kept: ^a.copy[] ^json:string[$a]
or added: ^a.copy[ $.3[3] ] ^json:string[$a]
or ignored ^a.copy[$a] ^json:string[$a]
4. array kept: ^a.create[] ^json:string[$a]
or added: ^a.create[4] ^json:string[$a]
or nested: ^a.create[$a] ^try-catch{ ^json:string[$a] }
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