Fix comment. Decrease limit

Author: audy

lib/src/serialization/mash.rs

@@ -59,8 +59,9 @@ pub fn write_mash_file(file: &mut dyn Write, sketches: &[Sketch]) -> FinchResult
 
 pub fn read_mash_file(file: &mut dyn BufRead) -> FinchResult<Vec<Sketch>> {
     let options = *message::ReaderOptions::new().traversal_limit_in_words(
-        // 10 Gigabytes
-        Some(10 * 1024 * 1024 * 1024),
+        // measured in words
+        // 1 word = 8 bytes
+        Some(2 * 1024 * 1024 * 1024),
     );
     let reader = capnp_serialize::read_message(file, options)?;
     let mash_data: min_hash::Reader = reader.get_root::<min_hash::Reader>()?;

lib/src/serialization/mod.rs

@@ -172,8 +172,9 @@ pub fn write_finch_file(file: &mut dyn Write, sketches: &[Sketch]) -> FinchResul
 
 pub fn read_finch_file(file: &mut dyn BufRead) -> FinchResult<Vec<Sketch>> {
     let options = *message::ReaderOptions::new().traversal_limit_in_words(
-        // 10 Gigabytes
-        Some(10 * 1024 * 1024 * 1024),
+        // measured in words
+        // 1 word = 8 bytes
+        Some(2 * 1024 * 1024 * 1024),
     );
     let reader = capnp_serialize::read_message(file, options)?;
     let cap_data: multisketch::Reader = reader.get_root::<multisketch::Reader>()?;