E.memoryArea not working on ESP8266 (due to char-iterator ?)

I did some testing with new function to use strings in flash.
Testcase is a SHA1-function and an server-object in WebIDE.
For testing a simple function calls SHA1 and creates an object.

• sent to the board with minification free:985
  
• checked memory some seconds later free:1168
  
• called testing function free:1101, duration 553ms
  
• checked memory some seconds later free:1133
  
  

Next testcase has SHA1-function and server-object in Flash.
Both, function and object are executed with eval from Flash.

• sent to the board with minification free:1156
  
• checked memory some seconds later free:1174
  
• called testing function free:1113, duration 500ms
  
• checked memory some seconds later free:1144
  
  

Result from this test(IMHO) is:

• sending from WebIDE takes some memory which is free later.
  
• at the end memory consumption does not change much.
  
• source from Flash executes 10% faster, no idea why
  
• reading sources from flash can be helpful for state oriented apps, where functions/objects are not needed all the time. Not used functions could then be dropped and others could be reloaded. LUA on ESP8266 supports something like this.
  
• I would like to have this function, especially for ESP8266 where memory is a problem