fs.readFileSync doesn't use the w+ flag

[valhalla-nc]

What version of Bun is running?

v1.1.37

What platform is your computer?

Linux 6.6.62 x86_64

What steps can reproduce the bug?

1. file test.mjs content

import fs from "fs";
fs.readFileSync("data.txt", { encoding: "utf8", flag: "w+" })

2. bun test.mjs
3. make sure data.txt doesn't exist

What is the expected behavior?

run node test.mjs

<no output>

created a new file data.txt in the current directory.

What do you see instead?

error and no file created

1 | import fs from "fs";
2 | fs.readFileSync("data.txt", { encoding: "utf8", flag: "w+" })
       ^
ENOENT: No such file or directory
   errno: -2
 syscall: "open"
   path: "data.txt"

Additional information

No response