Give check, children, column, columns, draw, drawn, fields, format, head, index, key, n, name, named, names, null, number, op, reads, record, root, row, t and whole one meaning each

transform.go

@@ -19,7 +19,7 @@ func withTransforms(calls map[string]builtin) map[string]builtin {
 		if _, clash := calls[name]; clash {
 			panic("fejkdata: " + name + " is registered as a builtin and a transform")
 		}
-		calls[name] = builtin{arity: 1, check: transformArg, prep: transformPrep(fn), operands: transformOperand}
+		calls[name] = builtin{arity: 1, checkArgs: transformArg, prep: transformPrep(fn), operands: transformOperand}
 	}
 	return calls
 }