Function is_buffer

modules/llrt_buffer/src/buffer.rs:310–317

(ctx: Ctx<'js>, value: Value<'js>)

                let bytes = bytes.into();
                return Buffer::from_encoding(&ctx, bytes, encoding)?.into_js(&ctx);
            } else {
                let (array_buffer, _, source_offset) = ab_bytes.get_array_buffer()?.unwrap(); //we know it's an array buffer
                return Buffer::from_array_buffer_offset_length(
                    &ctx,
                    array_buffer,
                    start + source_offset,
                    end - start,
                );
            }
        }
    }