Added Walk and WalkFn to index API
Added Walk and WalkFn to index API
GrahamGoudeau21/tchaik,solarnz/tchaik,GrahamGoudeau21/tchaik,tchaik/tchaik,solarnz/tchaik,solarnz/tchaik,GrahamGoudeau21/tchaik,tchaik/tchaik,solarnz/tchaik,GrahamGoudeau21/tchaik,tchaik/tchaik,tchaik/tchaik