Working with typed defaults in Viper
Release 1.0 - ...
As of RC2, Viper methods such as this.field(), itemdata.field() and datatable.getvalue() return typed internal defaults instead of reverting to an empty string if otherwise unresolved (when no explicit default parameter is passed):
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{itemdata.field(ShowFrom)} ==> 0001-01-01T00:00:00
{itemdata.field(ShowFrom, default=null)} ==> {itemdata.field(ShowFrom, default=null)}
{itemdata.field(ShowFrom, default='')} ==>
{sxml.gettypename(itemdata.field(ShowFrom))} ==> datetime
{sxml.gettypename(itemdata.field(ShowFrom, default=''))} ==> string
{sxml.gettypename(itemdata.field(ShowFrom, default=true))} ==> boolean
{sxml.gettypename(itemdata.field(ShowFrom, default=null), default='null')} == null
{datetime.format(itemdata.field(showfrom, default=null), 'd MMMM yyyy', default='Not set')} ==> Not set
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Since this behavior is a breaking change since RC1, a compatibility setting has been introduced. Setting compatibility to RC1 will make defaulting behave like in RC1.