people why when i am using adodb.recordset then i must to declare a field type like a constant, Adodb doest know any types ????

for example why i can type rs.fields.Append "F1", adLongVarChar, Len(v1)
withoyt defining const

<%
Dim V1

Const adLongVarChar = 201

V1 = "value"
Set rs = CreateObject("ADODB.RecordSet")
rs.fields.Append "F1", adLongVarChar, Len(v1)
rs.open
rs.AddNew
rs.fields("F1").value = v1
response.write(rs.fields("F1").value)
Set rs = Nothing
%>