improve Doc.encloseSep

Created by  ammkrn  on July 30, 2021

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mention group operator with infix operators

Created by  ammkrn  on July 20, 2021

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change implementation of alwaysHang

Created by  ammkrn  on July 20, 2021

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first record

Created by  ammkrn  on July 14, 2021

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