Hmm. I'll probably just wait until it's released for PIO. My project has >20 .cpp and .h files, and I dread the prospect of converting it to .ino files.
Sounds like you think that Teensyduino 1.54 will solve the...
After much initial difficulty, I've been (mostly*) successfully using SdFat 1.1.4 since last Fall. In starting a new project (using PlatformIO), I noticed that there are newer versions of SdFat available (up to 2.0.5)....