public static UpdateDefinition<TDocument> Push<TDocument, TItem>(
	this UpdateDefinition<TDocument> update,
	Expression<Func<TDocument, IEnumerable<TItem>>> field,
	TItem value
)

<ExtensionAttribute>
Public Shared Function Push(Of TDocument, TItem) ( 
	update As UpdateDefinition(Of TDocument),
	field As Expression(Of Func(Of TDocument, IEnumerable(Of TItem))),
	value As TItem
) As UpdateDefinition(Of TDocument)

[<ExtensionAttribute>]
static member Push : 
        update : UpdateDefinition<'TDocument> * 
        field : Expression<Func<'TDocument, IEnumerable<'TItem>>> * 
        value : 'TItem -> UpdateDefinition<'TDocument>