Looks like u: has a different domain than 10&u: which is interesting as I am 
not sure what meaning a floating or complex argument would have for u: 

Makes more sense to me to have it return a domain error based on type than the 
present behaviour, but backwards compatibility could always be a factor.

    JVERSION
Engine: j805/j64/darwin
Beta-11: commercial/2016-08-23T13:05:27
Library: 8.05.03
Qt IDE: 1.4.10/5.4.2
Platform: Darwin 64
Installer: J805 install
InstallPath: /applications/j64-80511
Contact: www.jsoftware.com
   u: {.50 1.1
2
   u: {. 50 1j1
2
    10 u: {.50 1.1
|domain error
|   10     u:{.50 1.1
    u: 1j1
|domain error
|       u:1j1

Cheers, bob

> On Aug 26, 2016, at 1:43 PM, Raul Miller <[email protected]> wrote:
> 
> u: {.50 1.1

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