[Octave-bug-tracker] [bug #49348] Treat multi-byte characters as one character for char array

[Markus Mützel]

Follow-up Comment #14, bug #49348 (project octave):

As a rule of thumb when working with strings:
- Casting from a numeric stream to char is problematic. It is important to
consider the input encoding (equally in Matlab and in Octave). Use
`native2unicode` instead of casting to char.
- It it not save to expect a complete code point entity when indexing into a
character array (equally in Matlab and in Octave). Octave has the function
`unicode_idx` to somewhat mitigate this issue.

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