DeepHash for a VCL Spec is base62-encoded SHA512/224.
Almost certainly, two Specs are equivalent iff their DeepHashes are equal (unless we've discovered a SHA512 collision). Base62 encoding is strictly alphanumeric, so VCL config names (which include the hash) are very likely safe in any context. With the "vk8s_ing_" prefix, VCL config names are 47 bytes long. Closes #14
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