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This is a special vector type used to represent of known length but unknown type.
unknown(n = 0)is_unknown(x)# S3 method for unknown vec_type2(x, y)
is_unknown(x)
# S3 method for unknown vec_type2(x, y)
Length of vector
# NOT RUN { vec_ptype() vec_ptype(NA) vec_ptype(unknown(), "x") # }
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