Closed as not planned
Description
Similarly to #1400 I think it would make sense to have a fast path for vec_assign(x, integer())
The motivation is also similar: e.g. when using vec_assign() in a coalesce() like fashion vec_assign(x, is.na(x), 1L).
Benchmark
library(rlang)
library(vctrs)
x <- 0L + 1:10e6
bench::mark(
vec_assign = {vec_assign(x, integer(), integer())},
check = FALSE
)
#> # A tibble: 1 x 6
#> expression min median `itr/sec` mem_alloc `gc/sec`
#> <bch:expr> <bch:tm> <bch:tm> <dbl> <bch:byt> <dbl>
#> 1 vec_assign 5.1ms 5.53ms 165. 38.2MB 172.Created on 2021-06-25 by the reprex package (v2.0.0)
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