Hint Resolve node_precise.

Corollary node_data_eq : forall gsh1 gsh2 sh1 sh2 rep1 rep2 p, readable_share sh1 -> readable_share sh2 ->
repable_signed (data rep1) -> repable_signed (data rep2) ->
node_data gsh1 gsh2 sh1 rep1 p * node_data gsh1 gsh2 sh2 rep2 p |-- !!(data rep1 = data rep2).