Dynamic string formatting?

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argument (position), width, and precision can be specified at runtime as named format arguments.
The fill character is specified only at comptime as part of the format string.

Example:

const std = @import("std");

pub fn main() void {
    std.debug.print("{[value]s:_^[width]}\n", .{
        .value = "hi",
        .width = 10,
    });
}

prints: ____hi____

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