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MAX_MMR_LEAF_COUNT

cumulus_primitives_spec_messaging::mmr

Constant MAX_MMR_LEAF_COUNT 

Source 
pub const MAX_MMR_LEAF_COUNT: u64 = _; // 281_474_976_710_656u64
Expand description

Upper bound on any leaf count node positions are derived from; mmr_lib’s node count overflows u64 above 2^63. Peer-supplied counts are checked against this first.