NA parameter ignored for read_tsv since 2.0.0

[sbachstein]

Since version 2.0.0 the na parameter is ignored entirely for read_tsv.

Input test.csv:

A,B,C
:,k,l
m,:,n

Command:
readr::read_csv('test.csv', na = c(":"))

Output (as expected):

Rows: 2 Columns: 3                                                                                                 
── Column specification ────────────────────────────────────────────────────────────────────────────────────────────────
Delimiter: ","
chr (3): A, B, C

ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.
# A tibble: 2 x 3
  A     B     C    
  <chr> <chr> <chr>
1 NA    k     l    
2 m     NA    n

On the other hand

Input test.tsv:

A	B	C
:	k	l
m	:	n

Command:
readr::read_tsv('test.tsv', na = c(":"))

Output (no NA replacements):

Rows: 2 Columns: 3                                                                                                 
── Column specification ────────────────────────────────────────────────────────────────────────────────────────────────
Delimiter: "\t"
chr (3): A, B, C

ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.
# A tibble: 2 x 3
  A     B     C    
  <chr> <chr> <chr>
1 :     k     l    
2 m     :     n 

[jimhester]

Duplicate of #1255, this is already fixed in the development version of readr.