Default - different behaviour for SC to Client-Side

Is the data binding default function meant to work the same for both SC (in my case PHP) and client-side?

I’m finding that the behaviour for empty strings (not NULL) is different:
Server Connect treats an empty string as something that would trigger the default value however, client-side formatter seems to leave it as an empty string.

e.g. imagine a SC returns two values

firstname = 'John'
preferredname = 'Johnny'

I use

preferredname.default(firstname)

to show the preferred name if present, otherwise the first name.

if it were:
firstname = 'John'
preferredname = '' (not preferredname = null)
and

preferredname.default(firstname)

it would display the blank string without triggering the default value
however the same thing in SC does trigger the default value.

To demonstrate:
I set a value on SC



Returns values:
image

In a table cell I show the results of Server Connect default, Client-Side default, and a workaround using ternary statement looking at the length of the string:

<td 
dmx-html="pupsurname.uppercase()+',<br> 
SC Def:'+prefname_def.titlecase()+',<br> 
C-S Def:'+pupprefname.default(pupfname).titlecase()+',<br> 
Ternary:'+(pupprefname.length() > 0 ? pupprefname : pupfname).titlecase()">
</td>

Cell Result:
image

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