[Rd] [External] hashtab implementation

[Taras Zakharko]

Since this topic has came up, may I dare to add some other comments? 

- it would be great if fast hash computation would be exposed at the R level (existing implementations such as rlang and digest rely on serialisation which adds unnessesry overhead), that would be very useful for many applications. 

- It might be useful if hash tables supported `==` operator for equality as well. This would mean making the hash function generic. 


Best, 

Taras
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