req_body_multipart fails when an argument contains the letter "D"

[sebastian-c]

I've been trying to build a multipart request which contains directives and data. For some reason, the letter "d" seems to cause problems. The example in the documentation seems to work, but for whatever strange reason, I can't build a request that contains that letter.

I'm using httr 0.2.3

Does work

req <- request("https://example.com") %>%
  req_body_multipart(a = "some data") 

Doesn't work

req <- request("https://example.com") %>%
  req_body_multipart(d = "some data") 

Error in `modify_list()`:
! All components of ... must be named
Run `rlang::last_trace()` to see where the error occurred.

Doesn't work

req <- request("https://example.com") %>%
  req_body_multipart(data = "some data") 

Error in `modify_list()`:
! All components of ... must be named
Run `rlang::last_trace()` to see where the error occurred.

Does work

req <- request("https://example.com") %>%
  req_body_multipart(taramasalata = "some data") 

Rlang trace:

rlang::last_trace(drop=FALSE)
<error/rlang_error>
Error in `modify_list()`:
! All components of ... must be named
---
Backtrace:
    ▆
 1. ├─request("https://example.com") %>% req_body_multipart(d = "some data")
 2. └─httr2::req_body_multipart(., d = "some data")
 3.   └─httr2:::modify_body_data(.req$body$data, ...)
 4.     └─httr2:::modify_list(data, ...)
 5.       └─rlang::abort("All components of ... must be named")

[hadley]

This is a partial matching problem — looks like modify_body_data() needs to use .data as the first argument.

This is basically the same problem as described in https://design.tidyverse.org/dots-prefix.html.