HashReflect perform stable hashing of value using reflecting to determine the type.

MustHashReflect is like [HashReflect] but infaillible.

DEBUG_BIGDECIMAL the logging tracer is so heaviy if activated by default that it's worth putting all the tracing support behind a manually activated flag.

Max signigicant digits accepted by `graph-node` See https://github.com/graphprotocol/graph-node/blob/9d013f75f2a565e3d126737593e3a30d1b2f212e/graph/src/data/store/scalar.rs#L46.

MAX_U192 is the max value of type U192 equivalent to 6277101735386680763835789423207666416102355444464034512895.

BigDecimal replicates `graph-node` way of representing, parsing and printing big decimal values.

MapUnsafe is like Map[K, V StableHashable] but it drops the requierement on StableHashable for the value type.