[Jbeta] m&i. and boxed unicode

[bill lam]

I reported this issue and found that it still exists in this beta, is the result 
correct?

    a=. <("1) u: 3 3$'abcd'
      a i. <'abc'
0
      a&i. <'abc'
3
      a&i. <u: 'abc'
0
similarly

   b=. <("1) 3 3$'abcd'
      b i. <'abc'
0
      b&i. <'abc'
0
      b&i. <u: 'abc'
3

--
regards,
bill
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