ChunkType Fill always return 0

[bongbui321]

Hi, If I understand correctly the Fill Chunk type will fill the number of blocks with 4 specified data bytes in the data section of fill chunk right? I have't dived deep in the codebase but it always seem to return 0, is that the correct intention of fill ChunkType

I'm not entirely sure the purpose of Fill Chunk Type, reading says this fills the blocks with 4 bytes of data. However, this repo always set the values to 0. Is it the intended behaviour?