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Unicode | u: _ _ _ | Unicode

Unicode or 2-byte characters are a new datatype. Unicode arrays are created by the verb`u:` .`` Existing verbs are extended to work on unicodes.

The monad`u:` applies to several kinds of arguments:
Argument | Result
1-byte characters | same as`2&u:`
2-byte characters | copy of argument
integers | same as`4&u:`
The inverse of the monad`u:` is`3&u:` |  | The dyad`u:` takes a scalar integer left argument and applies to several kinds of arguments:
Left | Right |  | Result
`1` | 2-byte characters |  | 1-byte characters; high order bytes are discarded
`2` | 1-byte characters |  | 2-byte characters; high order bytes are 0
`3` | 2-byte characters |  | integers
`4` | integers |  | 2-byte characters; integers must be from 0 to 65535
`5` | 2-byte characters |  | 1-byte characters; high order bytes must be 0 (and are discarded)
`6` | 1-byte characters |  | 2-byte characters; pairs of 1-byte characters are converted to 2-byte characters
`1&u:` and`2&u:` is an inverse pair, as are`3&u:` and`4&u:` .

2-byte characters can not be entered the keyboard. The display of an array`x` of 2-byte characters is that of`1 u: x` ,`` that is, discarding the high-order byte of each 2-byte character.
Examples:

       ] t=: u: 'We the people'
    We the people
       3!:0 t
    131072                         the unicode datatype numeric code is 131072

       u: 97 98 99 +/ 0 256 512 1024
    aaaa                           2-byte characters have the same
    bbbb                           display as 1-byte characters
    cccc

       'a' = u: 97 + 0 256 512 1024
    1 0 0 0

       ] t=: (2 4$'abcdefgh') , u: 'wxyz'
    abcd                           1- and 2-byte characters can be catenated together.
    efgh                           The 1-byte characters are promoted.
    wxyz
       3!:0 t
    131072

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