Wrong Output Freq on Teensy 3.2

[zshivers]

I believe there is a bug in this library, related to the binary search tree logic in setPeriod().

The logic never sets clockSelectBits to 2, where the previous implementation (commented code) can.

Specific case which can cause incorrect frequency output:

#include <TimerOne.h>

void pulse(void);

void setup() {  
  pinMode(17, OUTPUT);
  Timer1.initialize(1e6/92); // 92 Hertz
  Timer1.attachInterrupt(pulse);
}

void loop() {
}

// create short pulse every interrupt
void pulse(void) {
  digitalWrite(17, LOW);
  delay(1);
  digitalWrite(17, HIGH);
}

The resulting logic probe capture, showing an output frequency of 185 Hz:

This bug seems not to be present when disabling the binary tree optimized code, and using the original version.