MAX_PART_SIZE (16MB) should not apply to data partitions.

[AVee]

In the validate function in lib.rs there's a check that says partition sizes cannot be larger then 16MB:

esp-idf-part/src/lib.rs

Lines 320 to 324 in 3774056

	// Partitions cannot exceed 16MB; see:
	// https://github.com/espressif/esp-idf/blob/c212305/components/bootloader_support/src/esp_image_format.c#L158-L161
	if partition.size() > MAX_PART_SIZE {
	return Err(Error::PartitionTooLarge(partition.name()));
	}

This check should not apply to data partitions which can be used even when they exceed 16MB. I think this check should be
if partition.ty() == Type::App && partition.size() > MAX_PART_SIZE {

The IDF bootloader code referenced there does indeed check this 16MB limit, but if I read that code correctly it only does so for the partition it tries to boot from. If I write a partition table manually using espflash write-bin 0x8000 partitions.bin to a S3 with 32MB flash I can use a 28MB data partition just fine.