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switch statement breaks string comparison

See original GitHub issue

I hope I’m not going nuts, this really seems “off the wall” - what am I missing?

I have code in a node which works 100% as expected but if I include a switch statement above it, it produces bizarre results.

What are the steps to reproduce?

let repo='/home/pi/H4firmware'
let hardcoded='/home/pi/H4firmware/H4.ino.d1_mini.bin'
let bin1
let bin2
let type='WEMOS_D1MINI'
bin1='d1_mini'
switch(type){
    case 'WEMOS_D1MINI':
        bin2='di_mini';
        break;
}
//bin2='d1_mini' // comment out this line and msg is '...nuts' 
let f1=`${repo}/H4.ino.${bin1}.bin`
let f2=`${repo}/H4.ino.${bin2}.bin`
if(f1!==f2) node.warn('completeley nuts')
else node.warn('perfectly normal')
node.warn('f1='+f1+' '+typeof f1+' L='+f1.length)
node.warn('f2='+f2+' '+typeof f2+' L='+f2.length)
node.warn(f1===hardcoded) // true OF COURSE!
node.warn(f2===hardcoded) // false ???

return msg;

What do you expect to happen?

I expect f1===f2=== hardcoded and that the msg"completely normal" should appear

Result with bin2 assignment commented out

4/3/2020, 11:43:06 PMnode: Works OK
function : (warn)
"completeley nuts"
4/3/2020, 11:43:06 PMnode: Works OK
function : (warn)
"f1=/home/pi/H4firmware/H4.ino.d1_mini.bin string L=38"
4/3/2020, 11:43:06 PMnode: Works OK
function : (warn)
"f2=/home/pi/H4firmware/H4.ino.di_mini.bin string L=38"
4/3/2020, 11:43:06 PMnode: Works OK
function : (warn)
true
4/3/2020, 11:43:06 PMnode: Works OK
function : (warn)
false

Result with bin2 assignment overriding value set inside switch


4/3/2020, 11:49:06 PMnode: Works OK
function : (warn)
"perfectly normal"
4/3/2020, 11:49:06 PMnode: Works OK
function : (warn)
"f1=/home/pi/H4firmware/H4.ino.d1_mini.bin string L=38"
4/3/2020, 11:49:06 PMnode: Works OK
function : (warn)
"f2=/home/pi/H4firmware/H4.ino.d1_mini.bin string L=38"
4/3/2020, 11:49:06 PMnode: Works OK
function : (warn)
true
4/3/2020, 11:49:06 PMnode: Works OK
function : (warn)
true