Effect of weight=100 on a single spread block in a nomad job

The documentation contains several examples showing a single spread stanza with weight = 100.

The documentation in spread Block - Job Specification | Nomad | HashiCorp Developer states that

Weights can be used when there is more than one spread or affinity block to express relative preference across them.

Does this weight have an effect then? Does it affect binpacking or any other scheduling constraint then for example ?