different string types string and sq_string

[Ben Barrowes]

What is the difference between the two different string types in octave? 
string and sq_string?

For example:
octave:18> a="ff"
a = ff
octave:19> b='ff'
b = ff

results in:
 Prot Name            Size                     Bytes  Class
 ==== ====            ====                     =====  =====
  rwd a               1x2                          2  string
  rwd b               1x2                          2  sq_string

This difference leads the ubiquitous error cluttering my stdout:
octave:23> [a,b]
warning: concatenation of different character string types may have 
unintended consequences
ans = ffff
octave:24>

What "unintended consequences" may happen?

How can I turn this warning off?
> warning off
doesn't work...



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