diff --git a/blocks_compressed.js b/blocks_compressed.js
index 83eec0264..a3553a179 100644
--- a/blocks_compressed.js
+++ b/blocks_compressed.js
@@ -145,8 +145,8 @@ e.nextConnection}return b},compose:function(a){var b=a.getInputTargetBlock("STAC
 this.getInput("ADD"+b);a.valueConnection_=c&&c.connection.targetConnection;b++;a=a.nextConnection&&a.nextConnection.targetBlock()}},updateShape_:function(){this.itemCount_&&this.getInput("EMPTY")?this.removeInput("EMPTY"):this.itemCount_||this.getInput("EMPTY")||this.appendDummyInput("EMPTY").appendField(this.newQuote_(!0)).appendField(this.newQuote_(!1));for(var a=0;a<this.itemCount_;a++)if(!this.getInput("ADD"+a)){var b=this.appendValueInput("ADD"+a);0==a&&b.appendField(Blockly.Msg.TEXT_JOIN_TITLE_CREATEWITH)}for(;this.getInput("ADD"+
 a);)this.removeInput("ADD"+a),a++}};Blockly.Constants.Text.TEXT_JOIN_EXTENSION=function(){this.mixin(Blockly.Constants.Text.QUOTE_IMAGE_MIXIN);this.itemCount_=2;this.updateShape_();this.setMutator(new Blockly.Mutator(["text_create_join_item"]))};Blockly.Constants.Text.TEXT_APPEND_TOOLTIP_EXTENSION=function(){var a=this;this.setTooltip(function(){return Blockly.Msg.TEXT_APPEND_TOOLTIP?Blockly.Msg.TEXT_APPEND_TOOLTIP.replace("%1",a.getFieldValue("VAR")):""})};
 Blockly.Constants.Text.TEXT_INDEXOF_TOOLTIP_EXTENSION=function(){var a=this;this.setTooltip(function(){return Blockly.Msg.TEXT_INDEXOF_TOOLTIP.replace("%1",a.workspace.options.oneBasedIndex?"0":"-1")})};
-Blockly.Constants.Text.TEXT_CHARAT_MUTATOR_MIXIN={mutationToDom:function(){var a=document.createElement("mutation"),b=this.getInput("AT").type==Blockly.INPUT_VALUE;a.setAttribute("at",b);return a},domToMutation:function(a){a="false"!=a.getAttribute("at");this.updateAt_(a)},updateAt_:function(a){this.removeInput("AT",!0);this.removeInput("ORDINAL",!0);a&&(this.appendValueInput("AT").setCheck("Number"),Blockly.Msg.ORDINAL_NUMBER_SUFFIX&&this.appendDummyInput("ORDINAL").appendField(Blockly.Msg.ORDINAL_NUMBER_SUFFIX));
-Blockly.Msg.TEXT_CHARAT_TAIL&&(this.removeInput("TAIL",!0),this.appendDummyInput("TAIL").appendField(Blockly.Msg.TEXT_CHARAT_TAIL));this.isAt_=a}};
+Blockly.Constants.Text.TEXT_CHARAT_MUTATOR_MIXIN={mutationToDom:function(){var a=document.createElement("mutation");a.setAttribute("at",!!this.isAt_);return a},domToMutation:function(a){a="false"!=a.getAttribute("at");this.updateAt_(a)},updateAt_:function(a){this.removeInput("AT",!0);this.removeInput("ORDINAL",!0);a&&(this.appendValueInput("AT").setCheck("Number"),Blockly.Msg.ORDINAL_NUMBER_SUFFIX&&this.appendDummyInput("ORDINAL").appendField(Blockly.Msg.ORDINAL_NUMBER_SUFFIX));Blockly.Msg.TEXT_CHARAT_TAIL&&
+(this.removeInput("TAIL",!0),this.appendDummyInput("TAIL").appendField(Blockly.Msg.TEXT_CHARAT_TAIL));this.isAt_=a}};
 Blockly.Constants.Text.TEXT_CHARAT_EXTENSION=function(){this.getField("WHERE").setValidator(function(a){var b="FROM_START"==a||"FROM_END"==a;if(b!=this.isAt_){var d=this.sourceBlock_;d.updateAt_(b);d.setFieldValue(a,"WHERE");return null}});this.updateAt_(!0);var a=this;this.setTooltip(function(){var b=a.getFieldValue("WHERE"),c=Blockly.Msg.TEXT_CHARAT_TOOLTIP;("FROM_START"==b||"FROM_END"==b)&&(b="FROM_START"==b?Blockly.Msg.LISTS_INDEX_FROM_START_TOOLTIP:Blockly.Msg.LISTS_INDEX_FROM_END_TOOLTIP)&&
 (c+="  "+b.replace("%1",a.workspace.options.oneBasedIndex?"#1":"#0"));return c})};Blockly.Extensions.register("text_indexOf_tooltip",Blockly.Constants.Text.TEXT_INDEXOF_TOOLTIP_EXTENSION);Blockly.Extensions.register("text_quotes",Blockly.Constants.Text.TEXT_QUOTES_EXTENSION);Blockly.Extensions.register("text_append_tooltip",Blockly.Constants.Text.TEXT_APPEND_TOOLTIP_EXTENSION);Blockly.Extensions.registerMutator("text_join_mutator",Blockly.Constants.Text.TEXT_JOIN_MUTATOR_MIXIN,Blockly.Constants.Text.TEXT_JOIN_EXTENSION);
 Blockly.Extensions.registerMutator("text_charAt_mutator",Blockly.Constants.Text.TEXT_CHARAT_MUTATOR_MIXIN,Blockly.Constants.Text.TEXT_CHARAT_EXTENSION);Blockly.Blocks.variables={};Blockly.Constants.Variables={};Blockly.Constants.Variables.HUE=330;Blockly.Blocks.variables.HUE=Blockly.Constants.Variables.HUE;