File_Adapter: writing over large files causes a crash

I accidentally wrote 4 gigs to a .json file due to a tree-structure error. Then I fixed the error and attempted to write 300k to the same file, and grasshopper crashed (each of three times I tried). Can we introduce something to prevent such crashes?

Start in the File_Adapter entry point responsible for writing .json files and reproduce the reported failures with a 4 GB write followed by a 300k write. Trace where the crash occurs and check any existing tests around large-file handling. Done means repeated large writes no longer crash Grasshopper, with the behavior verified by a regression test if the project provides one.

Written by the indexing model from the issue text.